Merge branch 'master' into dev
#29 - Graphs can now be exportet as PNG
#30 - Graphs can now be exportet to Jpg and Pdf
#31 - Removed doubled code, changed shortcuts
#32 - Width and heigth of exported image can now be changed while exporting to Png
#33 - Bufix: Image dimensions can not be smaller or euqal to zero anymore
#34 - Image dimensions can now also be specified for export to Pdf and Jpg
#35 - Prepared for release 1.0.5
Merge branch 'release-1.0.5'