Disabled travis e-mail notifications
Small fix in detecting language. Fixes needed to compile code using clang
Merge branch 'dev'

Merging content from dev
* Fixed problem with 2D sound mode
* More work on sound
* Minor changes to cmake files
Added cheats "all" & "allbuildings" (#163)
Removed find() & repeat() functions

Issue #168
Implemented AudioChange (partially)

There is some issues due to #173
Issue #172
Some optimalizations to AudioChange
Added music files cache
Added loading from custom files for Audio
* Key repeating in edit fields
Small fix to music cache
Fix for not saving robot programs

It was Windows-only bug.
issue #137
Fix for "Ability to select the object in Vault"

Issue #170
Added powermin= and powermax= parameters

Issue #174
Fix for #180 (bug in commit dd180dd88739eb7dd71a6431b2651a18a36599d3)
* Changed order of libs in cmake for clipboard
Merge branch 'dev' of github:colobot/colobot into dev