fix ValueError: .5em and fix ValueError: string cannot be subtracted from string#4

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encorehu wants to merge 3 commits intometalshark:masterfrom

encorehu:master

Commits on Oct 27, 2014

pep8: delete all blankline whitespaces
encorehu
committed
fix ValueError: .5em, use regex to fixing parse error: font-size: 2.5em; raise error: ValueError: .5em
encorehu
committed
fix ValueError: string cannot be subtracted from string, parse display:inline-block, raise
encorehu
committed