GUI improvements, compatibility fixes#9

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Aslan-Kosakian wants to merge 4 commits intoOpenFCST:masterfrom

Aslan-Kosakian:master

Commits on Jan 11, 2017

Improvements for GUI: typos, descriptions, minor fixes.
Aslan-Kosakian
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Commits on Jan 13, 2017

Updated the nightly testing script to completely reinstall OpenFCST before each nightly test.
Aslan-Kosakian
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Added matplotlib dependency for Python to README.rst file.
Aslan-Kosakian
committed

Commits on Jan 16, 2017

Removed pngmath.
Aslan-Kosakian
committed