Add configurable brackets#4

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imartingraham wants to merge 3 commits intomendezcode:masterfrom

imartingraham:add-configurable-brackets

Commits on Jan 31, 2015

Adds ability to configure the open and close shortcode brackets
imartingraham
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Updated README to include setTag example
imartingraham
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Reverted change where I used brackets [[ or ]] as the default instead of one [ or ]
imartingraham
committed