Better exception handling

You probably only want to rescue `ArgumentError` here, but certainly nothing more than the default `StandardError`. Rescuing `Exception` can lead to very strange behaviour.

See:
http://www.mikeperham.com/2012/03/03/the-perils-of-rescue-exception/
http://stackoverflow.com/a/10048406/1848
Merge pull request #159 from danielfone/patch-1

Better exception handling
Merge pull request #106 from BluePyth/piwik_provider

Adds Piwik Analytics Provider
add mission
add draft feature
Merge add-drafts. closes #167
add History markdown
Merge branch 'master' of github.com:plusjade/jekyll-bootstrap into create_markdown
Fixed outdated link
Merge pull request #170 from markijbema/patch-1

Fixed outdated link
Merge pull request #169 from marshallshen/create_markdown

Create markdown
[FIX] Fix tags output in :post task
[FIX] Fixed small typo in comment
Merge pull request #172 from coding46/patch-2

[FIX] Fixed small typo in comment
Merge pull request #171 from coding46/patch-1

[FIX] Fix tags output in :post task
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]"