Expression - newInstance() fix if the class name is variable (Unrecheable code when create class in oodynamica.zep test)
LetStatement fix typo geType() -> getType()
Variable added new shortcut methods isVariable(), isString()
Move ifs code to shortcut isNotVariableAndString()
Fix CompiledException -> CompilerException, PropertyAccess fix compile method()
Link & at compilationContext->compiler, fix doc at Variable getClassTypes()
Merge pull request #58 from zaets28rus/expression_newInstance

Fixes