Merge pull request #2 from mpetris/master

latest features and bugfixes
Merge pull request #3 from mpetris/master

sql delete operations performance optimizations
feature ref #52 implemented
Merge remote-tracking branch 'origin/master' into f52
Merge pull request #4 from catmadevel/f52

F52
Merge pull request #88 from catmadevel/master

f52