GUI added
Merge pull request #7 from RobSis/master

GUI added
Merge remote-tracking branch 'upstream/master'
Added two function app. tests, implemented function app. operator normalization
Merge branch 'master' of https://github.com/formanek/MathMLCan.git
Merge remote-tracking branch 'upstream/master'
Validate configuration
Merge pull request #8 from jakubadler/master

Properties added for MrowNormalizer
Merge pull request #9 from RobSis/validate-config

Validate configuration
Merge remote-tracking branch 'upstream/master'
MrowNormalizer refactoring