Fixed #67. Added expiration date for files
Merge branch 'master' of https://github.com/valentin12/bepasty-server

Merge master to add "expiration date for files" implementation
Made little pep8 checking and other small fixes
Fixes #43 Adds filename to url in the structure url#filename
Fixes #67. Simplified the timestamp code
Removed unused code for the expirationdate feature
Removed more unused code for the expiration date feature
Fixed bug for maxlife timestamp. Checking for -1 (forever) wasn't done, files got deleted immediately
Added functional tests with selenium for the expiration date feature
Added constant for FOREVER=-1. Simplified code
merged