Updated Rakefile :preview command to new Jekyll standards

jekyll --server --auto is deprecated and has been replaced with jekyll serve(r) -w(atch)
Updated _config.yml => removed auto property, deprecated in the latest jekyll
Merge pull request #179 from kvannotten/patch-1

Updated Rakefile :preview command to new Jekyll standards
Update History.markdown
Update 'rake post' to support category on command line

Updated comment.
Creating a post with multiple tags require no whitespaces between tags:
 rake post title="A Title" [date="2012-02-09"] ... tags=[tag1,tag2]
or quotes:
 rake post title="A Title" [date="2012-02-09"] ... tags="[tag1, tag2]"
Merge pull request #183 from Miguelos/patch-2

Update 'rake post' to support category on command line
fix parsing error
Merge pull request #189 from marshallshen/master

fix parsing error
Update readme to point to new separate documentation repository.
Loaded in new CSS, JS, glyphicons, added in IE Edge, testing this commit.
Added in html5shiv manually. IE6-7 no longer supported. Couldn't find a good CDN for this, google usage suggests downlaoding it. 'printshiv' This is for printed elements for IE 8.
Added in respond.min.js, removed old html5shiv as using the cdn that getbootstrap.com uses should work. Response.min.js doesn't work from CDN.
Possibly completed everything, actually.
Fixed sticky footer.
Added some custom Jekyll styling, because.
Removed local respond.js given that CDN does work, just not from file://
Created a Bootstrap-3 theme, readded the twitter theme, made bootstrap-3 default.
Remove empty quotes when category is empty.

When category = ""

Should print "category: " to file, current behaviour prints "category:
\"\"".

Latter creates an actual category, with a blank title. All posts created
since this update, without a category explicitly written in `rake`
command, or post directly edited, will belong to this category.
Simpler logic to category patch

Replace single line with cleaner, more readable Ruby.
Merge pull request #198 from parnmatt/patch-1

Remove empty quotes when category is empty.