buildsystem: quoted cmake variables

fixes #4, all variables are now enclosed with double quotes: "${var}"
buildsystem: fixed returning false if list doesn't contain requested item
engine: fixed typo in checking max_texture_units
Merge pull request #92 from TheJJ/cmakequotes

quotes for cmake variables
Argument '--version'
For writing current version of the Openage
Add myself into authors list
Merge pull request #100 from zuntrax/master

add -Wno-mismatched-tags flag for llvm builds
Merge remote-tracking branch 'sft-github/master'
Merge remote-tracking branch 'zuntrax/master'
Merge branch 'VersionLog' of BugExplorer/openage into master
args: fixed whitespace issues
misc: assign the best sounds available for creation and dying
Add a sound_id_destruction to TerrainObject and play it on building destruction
Args.cpp - small typo fix in print section
args: saner default for data_directory: "./assets"
nyan: added basic nyan documentation, not yet finished
Merge pull request #110 from franciscod/without-terminal

args: saner default for data_directory: "./assets"
Merge pull request #108 from franciscod/play-building-sounds

game: play the correct building creation and destruction sounds
mailmap: added another mail of myself
mailmap: mailmap does not support multiple alternative emails per line

redundancy, yay. this really is retarded, git. fix it.