Exposed getEmValue method to allow other js to call respond.getEmValue to get the pixel value of 1 em
Updated API Options secion in the readme with the now exposed getEmValue method
Fixed a markdown bug.
Updated example of getEmValue() spacing from tabs to 2 spaces for readability
Fixing another markdown issue
Going back to tabs instead of 2 spaces
Upadting the documentation with a link to response.js
Merge branch 'expose-get-em-value' of https://github.com/tsvensen/Respond into tsvensen-expose-get-em-value

Conflicts:
	README.md
	respond.src.js