Pykwalify

- Rewrote most of the error messages to be more human readable. See `docs/Upgrade Instructions.md`
for more details.
- It is now possible to use the exceptions that was raised for each validation error. It can be
found in the variable `c.validation_errors_exceptions`. They contain more detailed information
about the error.

- This feature is **NEW** and **EXPERIMENTAL**.
Implemented support for multiple values inside in a sequence.
This will allow the defenition of different types that one sequence can contain. You can either require
each value in the sequence to be valid against one to all of the different possibilities.
Tests show that it still maintains backward compatibility with all old schemas but it can't be guarantee.
If you find a regression in this release please file a bug report so it can be fixed ASAP.
- This feature is **NEW** and **EXPERIMENTAL**.
Added ability to define python files that can be used to have custom python code/functions that can be
called on all types so that custom/extra validation can be done on all data structures.
- Add new keyword 'func' that is a string and is used to point to a function loaded via the extension system.
- Add new keyword 'extensions' that can only be used on the top level of the schema. It is should be a list
with strings of files that should be loaded by the extension system. Paths can be relative or absolute.
- New cli option '-e FILE' or '--extension FILE' that can be used to load extension files from cli.
- Fixed a bug where types did not raise exceptions properly. If schema said it should be a map but data was
a sequence, no validation error was raised in earlier versions but now it raises a 'NotSequenceError' or
'NotMappingError'.

- Rework cli string that docopt uses. Removed redundant flags that docopt provides [--version & --help]
- Add support for timestamp validation
- Add new runtime dependency 'python-dateutil' that is used to validate timestamps
- Change how 'any' keyword is implemented to now accept anything and not just the implemented types. (See Upgrade Instructions document for migration details)

Switched back to semantic version numbering for this lib. See _README.md_ section _Important notes on version schema changes_ on how to fix any issues with this change.

- Added new and experimental validation rule allowempty. (See README for more info)
- Added TODO tracking file.
- Reworked the CLI to now use docopt and removede argparse.
- Implemented more typechecks, float, number, text, any
- Now suports python 3.3.x
- No longer support any python 2.x.y version
- Enabled pattern for map rule. It enables the validation of all keys in that map. (See README for more info)
- Alot more test files and now tests source_data and schema_data input arguments to core.py
- Alot of cleanup in the test suit

- Reworked the structure of the project to be more clean and easy to find stuff.
- lib/ folder is now removed and all contents is placed in the root of the project
- All scripts is now moved to its own folder scripts/ (To use the script during dev the path to the root of the project must be in your python path somehow, recomended is to create a virtualenv and export the correct path when it activates)
- New make target 'cleanegg'
- Fixed path bugs in Makefile
- Fixed path bugs in Manifest