log
Merge branch 'master' of https://github.com/Divendo/math-dragon

Conflicts:
	src/org/teaminfty/math_dragon/view/math/MathOperationLog.java
Merge branch 'master' of https://github.com/Divendo/math-dragon
Beta limit
Merge branch 'master' of https://github.com/Divendo/math-dragon

Conflicts:
	src/org/teaminfty/math_dragon/view/math/MathOperationLog.java
Merge branch 'master' into work

Conflicts:
	src/org/teaminfty/math_dragon/view/math/operation/Limit.java
	src/org/teaminfty/math_dragon/view/math/operation/binary/Power.java
Setup limits
Root now supported
setExponent(Expression) fix
Exponential symbolic combination supported
#72 partially fix (ex. 1, 3, 4, and 5), #84 #85 #86 #87 fix
power -> symbol fix
Variable powers are more secure and easier to maintain
#72 fix ex. 2
Added support for tutorial states in the database

Signed-off-by: Mark Kamsma <mark@markkamsma.nl>
Merge remote-tracking branch 'folkert/work' into work
Merge remote-tracking branch 'bas/basbranch2' into work
The cache of an expression is now properly invalidated

Signed-off-by: Mark Kamsma <mark@markkamsma.nl>
Parentheses are no longer placed around functions, fixes #103

Signed-off-by: Mark Kamsma <mark@markkamsma.nl>
Dragging an operation to an 'empty' screen now always succeeds.
Fixes #105

Signed-off-by: Mark Kamsma <mark@markkamsma.nl>