2-3000% performance enhancement in IE7

Use an array and not a string to store chunks internally. Increases
performance by 2-3000% in IE7. No measurable  changes in performance in
other browsers.
dynamic keys in getBlock fix
fixed join() to join('')
added filters
Removed incorrect fix in unit tests
Merge pull request #253 from jlkonsultab/master

2-3000% performance enhancement in IE7
updated dist/*.1.2.2.js
updated to 1.2.3
add 1.2.2 and 1.2.3 versioned files
remove mustache

since it is Uncaught ReferenceError: Mustache is not defined
Update index.html
update to more intuitive test names
Update coreTests.js
Update coreTests.js
Merge branch 'master' of https://github.com/linkedin/dustjs
Adding forward slash to escapeJs and unit tests for escapeJs
updating 1.2.3 with escapeJs changes
Merge pull request #263 from prashn64/master

Add forward slash and unit tests for j filter
Update package.json

updates to escapeJS
store template name in the global context