Instackup

New functionalities:
- gcloudstorage_tools
- GCloudStorageTool
- bucket property (setter)
- blob property (setter)
- uri property
- uri property (setter)
- rename_file
- rename_subfolder
- upload_subfolder
- download_subfolder
- delete_file
- delete_subfolder
- gsheets_tools
- GSheetsTool
- upload
- s3_tools
- S3Tool
- bucket property (setter)
- uri property
- uri property (setter)
- upload_subfolder
- download_subfolder


Removed functionalities:
- gcloudstorage_tools
- GCloudStorageTool
- set_by_path
- get_gs_path
- s3_tools
- S3Tool
- set_by_path
- get_gs_path

Minor additions:
- RedShiftTool now inherits from PostgreSQLTool, so it gains 2 extra methods.
- In GCloudStorageTool \_\_init\_\_ (when setting by the subfolder parameter) and set_subfolder methods, now it adds a trailing slash if it's missing.

Bug fixes:
- GCloudStorageTool.set_bucket method didn't reset the subfolder and filename attributes.
- GCloudStorageTool.set_subfolder method didn't reset the filename attribute.

Removed features:
- Package is not compatible with Google Cloud Composer anymore.

Other solved issues:
- Revised documentation.

Bug fixes:
- gsheets_tools and gcloudstorage_tools logging level were set to DEBUG instead of WARNING. ([Pull Request 1](https://github.com/Lavedonio/instackup/pull/1))

First beta release.

New functionalities:
- gcloudstorage_tools
- GCloudStorageTool
- blob property
- select_file
- \_\_get_blob_info
- get_file_info
- download_as_string
- sql_tools
- SQLTool
- \_\_init\_\_
- connect
- commit
- rollback
- close_connection
- execute_sql
- query
- SQLiteTool
- \_\_init\_\_
- describe_table

Removed functionalities:
- gcloudstorage_tools
- GCloudStorageTool
- set_blob
- list_bucket_attributes
- get_blob_info
- list_blob_attributes

Modified functionalities:
- bigquery_tools
- BigQueryTool
- upload_from_gcs
- upload_from_file

Bug fixes:
- GSheetsTool class was calling a unset attribute (self.spreadsheet) in an error message.
- GSheetsTool wasn't setting the correct worksheet when setting by the sheet_url parameter in its \_\_init\_\_ and set_spreadsheet_by_url methods.
- GSheetsTool now can take either a String or Integer value for the sheet_gid parameter in its \_\_init\_\_ and set_worksheet_by_id methods.
- general_tools log module still had the old file name; changed to correct one.

Other additions:
- Refactored documentation to create a clearer README
- postgresql_tools module renamed to sql_tools