add variables
debugginng off
update documentation and formatting. also fix bounding boxes of math-variable
MathVariable now uses the right text size

Signed-off-by: Mark Kamsma <mark@markkamsma.nl>
Operands of linear binary operations are now handled correctly in the drag-and-drop interface

Signed-off-by: Mark Kamsma <mark@markkamsma.nl>
Symja is now loaded at startup instead of loading it at the first calculation

Signed-off-by: Mark Kamsma <mark@markkamsma.nl>
Added wolfram alpha support.
merge conflict fixed
javadocs
javadocs
set right resolutions for wolfram logo
Set the right color for the Wolfram|Alpha icon

Signed-off-by: Mark Kamsma <mark@markkamsma.nl>
Merge branch 'master' into work

Conflicts:
	res/layout/fragment_main_screen.xml
	res/values/strings.xml

Signed-off-by: TimdeJonge <t.dejonge@students.uu.nl>