Added Rounding functions: floor, ceil and round
Added rounding tests
added Function Rounding Tests
fixed build round called
Simiplfied Travis Testing (Based on #22), added build status to readme.
Temporaaly Removed 2.6 testing, 2.6 broken in this branches fixed in different branch.
Merge branch 'rounding'

Conflicts:
	tests/test_Equation.py (No Conflicts found, Manually Fixed)