Makes the parse_xml methods of AscColorSpaceBase return bool
Adds AscXMLBase class for classes which can be represented by XML. Adds build_element methods to ColorCorrection, Sop and Sat
Adds _de_exponent, which translates floats to strings without exponent notation. Will still round though.
Adds tests for new xml build methods, tweaks some variable naming
Changes write_cc to use new XML
Python 34 compat fixes and tweaks. Cdl_convert now has 100% coverage
Merge branch 'feature/write_cc_xml' into develop