Adds navbar-inverse support

Adds a if clause which checks the BOOTSTRAP_NAVBAR_INVERSE flag to use the navbar-inverse insted of the navbar-default
Merge pull request #11 from magnunleno/patch-1

Adds navbar-inverse support
Fixes #16 - hardcoded path for tags page.
Upgraded Font Awesome, and made necessary fixes.

The previous version of Font Awesome included in the theme gave errors with the local simple Pelican server. Upgrading to 4.0.3 (which is made for Bootstrap3) fixed the error, but requires changes because the icon names have changed.

This fixes #18 (as far as I can tell).
Merge pull request #17 from hlapp/fix-hardcoded-tags

Fixes #16 - hardcoded path for tags page.
Merge pull request #19 from hlapp/fix-fontawesome

Upgraded Font Awesome, and made necessary fixes.
Adds Breadcrumbs

When setting the DISPLAY_BREADCRUMBS flags, the site will have
breadcrumbs in the following templates: archives, article, category,
categories, page, tag and tags.