RELEASE-2.0.0a2

Second alpha release

Additions:

 - If install fails due to unknown channel, ask to discover [saltybeagle]

Bug Fixes:

 - Fixed minimum PHP version checks in Channel\RemotePackage [gauthierm]
 - Add SQLite3 as a required extension [saltybeagle]
 - Fix bin/pyrus script [saltybeagle]
 - Loop when discovering a channel twice [boekkooi]
 - Docs directory should use channel/package not package/channel [saltybeagle]