Added missing default qualifiers to some sass variables.
Provide a way to configure font family for subtitle.
Make header font size customizable.

Change $header-font-size variable to specify size.
Merge pull request #288 from jakemcc/octo-head

Make header font-size customizable.
Add missing $header-padding-top, $header-padding-bottom.
Add header font size and padding to custom layout
Remove !default from property values
Introduce distinction between preview/productive site generation

Posts which contain the YAML attribute `published: false` are usually
not generated by Jekyll. With this patch they can be previewed just
like published posts on localhost using `rake watch`or `rake preview`.

NOTICE: Before pushing to the productive environment, use `rake generate`
to update the public directory and remove posts which are flagged not to be
published.
Improved, I think, the Titlecase plugin
Set flag in preview mode and re-generate files before deployment if necessary
nested lists should not have a margin-bottom
Merge pull request #298 from nistude/master

Nested lists should not have margin-bottom
use correct .rvmrc syntax
Merge pull request #315 from vamsee/master

rvm does not recognize the current .rvmrc syntax
Merge pull request #293 from imathis/generate_environment

Introduce distinction between preview/productive site generation
Merge pull request #295 from jbrains/master

Capitalize word after '!' and '?'.
Merge pull request #270 from omo/missing-default-variables

Add missing default qualifiers to some sass variables.
Merge pull request #271 from simensen/ConfigureFontFamilyForSubtitle

Make font-family for subtitle configurable.
Merge pull request #225 from imathis/post_names

Add more flexibility to :new_page task
:copydot ignores thumbnail files starting with '._'