Fix error arising from Requests "No integers in headers" decree

Fix tag parsing for everything()

Better content-type parsing

Add delete_tags method

Better content decoding, fix for child attachment updates

Add top-level collection method

Add depth-agnostic all-collections retrieval method
Set Read API result limit to 100 by default

Add new MIME types for improved file download functionality

Add file dump convenience function
Move attachment functionality to its own class

Fix for included print statement in v1.1.11

Add parent item attachment

Better support for PDF retrieval

Explicit request encoding