Add shaded polygon to lineprofile output
Refactor perp_lines behavior
Add test for LineProfiler tool
Fix aliasing and update docstring
Update test now that aliasing has been removed
Use division consistently between PY2 and PY3
Update test to use floating point images and with updated values
Merge pull request #875 from blink1073/lineprofile-overlay

Add Shaded Polygon to LineProfile Plugin Output

Closes #865