Cfn-lint

Features
- Update CloudFormation Specs to July 12th, 2018
- Rule [E7012](https://github.com/aws-cloudformation/cfn-python-lint/blob/main/docs/rules.md#E7012) added to check the limits of attributes in a Mapping
- Rule [E2012](https://github.com/aws-cloudformation/cfn-python-lint/blob/main/docs/rules.md#E2012) added to check maximum size of a parameter value
- Rule [E1003](https://github.com/aws-cloudformation/cfn-python-lint/blob/main/docs/rules.md#E1003) added to check the maximum length of the template Description
- Guide created to help new users write new rules
Fixes
- Catch KeyError when trying to discover the line and column number of an error
- Update Lambda rules to support dotnet core
- Fix rule [E1017](https://github.com/aws-cloudformation/cfn-python-lint/blob/main/docs/rules.md#E1017) so we unpack first element of select as a dict
- Fix rule [E1024](https://github.com/aws-cloudformation/cfn-python-lint/blob/main/docs/rules.md#E1024) to support ImportValue and appropriately checking number for the last element

Features
- Support for Yaml C Parser when available.
- Catch rule processing errors and raise a lint error in their place.
- Add rules for the limit on Parameter, Mapping, Resource and Output names
- Add Rule [W3005](https://github.com/aws-cloudformation/cfn-python-lint/blob/main/docs/rules.md#W3005) to warn for when DependsOn is specified but not needed
- Add Rule [E2509](https://github.com/aws-cloudformation/cfn-python-lint/blob/main/docs/rules.md#E2509) to check if Security Group Descriptions are properly configured
- Add `source_url` to rules so rule reference documentation can be provided
Fixes
- Fixed issues when Conditions had lists for values
- Fixed issue where underscore was allowed for AlphaNumeric names

Features
- Try/Catch added to rule processing so code failures in rules won't crash cfn-lint
- Parse YAML files using C parser when available. Greatly speeds up YAML parsing.
Fixes
- Template class updated to handle conditions where lists are in the true/false values
- Fix regex for checking Resource, Output, etc. names to not include underscore

Features
- Update rule [E3020](https://github.com/aws-cloudformation/cfn-python-lint/blob/main/docs/rules.md#E3020) to validate A recordsets
Fixes
- Require "aws-sam-translator" dependency be at least 1.6.0
- Add support for wildcards in rule [E3013](https://github.com/aws-cloudformation/cfn-python-lint/blob/main/docs/rules.md#E3013) - Support conditions in Lists for rule [E3002](https://github.com/aws-cloudformation/cfn-python-lint/blob/main/docs/rules.md#E3002) - Include filename when we run into Null and Duplicate values when parsing yaml
- Rule W2510 now allows for AllowedValues instead of just Min/MaxValue for compliance of Lambda MemorySize
- Rule [E2530](https://github.com/aws-cloudformation/cfn-python-lint/blob/main/docs/rules.md#E2530) updated to checked AllowedValues for compliance of Lambda MemorySize

Features
- Serverless Transforms now handled by SAM libraries
- Add Rule [E2508](https://github.com/aws-cloudformation/cfn-python-lint/blob/main/docs/rules.md#E2508): Add checks for IAM
- Managed Policies attached to IAM user, group or role can't be more than 10
- An IAM user can be a member of no more than 10 groups
- There can only be 1 role in an instance profile
- AssumeRolePolicyDocument size is less than <2048 characters
- Add Rule [E1002](https://github.com/aws-cloudformation/cfn-python-lint/blob/main/docs/rules.md#E1002): Check overall template size to make sure its below
- Add Rule [E3013](https://github.com/aws-cloudformation/cfn-python-lint/blob/main/docs/rules.md#E3013): CloudFront aliases should contain valid domain names
- Add Rule [E3020](https://github.com/aws-cloudformation/cfn-python-lint/blob/main/docs/rules.md#E3020): Check if all RecordSets are correctly configured
- Strings end and start with double quotes
- Size is less than 256 characters
- Record Types are within the specification
- Short hand parameter switches and no longer need --template
Fixes
- Don't report a Condition not being used if it is used by another Condition

Fixes
- Fixed issues with Yaml and Json parsing for complex strings in Python 2.7
- Added eu-central-1 Availability Zones to acceptable AZ list
- Added nodejs8.10 to supported Lambda
- Added Version as an attribute for a Custom Resource
- Parseable output is now colon(:) delimited