2013.08.22 01:05 UTC+4 - Bugs fixed + a bit of new Function functionality (no pun intended)

Bug fixes:
1. Changed the order of functions in AnalyticFunction.cs - 'sin' was being replaced before 'arcsin', which led to bugs.
2. Added a 'ceiling' function to PrecompiledFunction.cs.

Functionality additions:
1. Added a 'round' function.

Also done some refactoring + Russian -> English translation.