initial rewrite
added simple parsing of Complex numbers
fixed parsing of decimal separator fomr complex part
changed tokenizer to be agnostic of complex syntax
added some more skeleton
first implementation of float typ exp4j
typo in method name
added support for unary minus/plus
fixed a bug in the shunting yard algorithm
added variables and benchmarking for floats
added custom operators/funtions copied tests from exp4j v0.3
fixed some issues fixed som etests
added variable handling
added exceptions and checking for Unknonw names
updated some tests
fixed test for custom functions
fixed various tests and added checks for unparseable expressions
updated pom config for cobertura
moved calculate method to abstract class and made it generic for Double and Float and added tests for Double precision
moved benchmarks to their own test class