Created a database to store formulas

Signed-off-by: Mark Kamsma <mark@markkamsma.nl>
Merge branch 'master' of https://github.com/Divendo/math-dragon

Conflicts:
	src/org/teaminfty/math_dragon/model/EvalHelper.java
	src/org/teaminfty/math_dragon/view/math/MathConstant.java
beta changes
MathOperationFunction finished