Automatic and manual PEP8 fixes, excluding E501: Line length to fix #101
PEP8 line length corrections
Replace has_key() with 'in' and other minor issues for #101
Change admin to call RW API functions directly to fix #87, add Invalid envelope id error, rename signals.py to admin_helper.py
Merge pull request #113 from eosrei/101/pep8

Automatic and manual PEP8 fixes for #101
Merge pull request #114 from eosrei/87/asset_upload

Call RW API functions directly for admin asset upload