add ExpressionBuilder
add operations for expression (math, logical, comparison)
add brackets in ExpressionBuilder
add operators in LambdaInstance, Lambda
Merge pull request #1 from morgen2009/master

add license and update code from master
limit maximal number of arguments for operation
fix operations priority
fix Path operation and tests for Lambda
add Lambda::complex
rename Lambda::_and to Lambda::and_ (also OR and XOR)
add LambdaInstance::like
type hinting in Lambda, LambdaInstance
use pwn method in Linq instead of LambdaFactory
implement LambdaInstance::linq
remove deprecated or unused files