Add customized BP Docs Wiki template.

The newer version of BP Docs Wiki uses theme compat, however we want to be
able to use the older template format to use the wiki sidebar.

For more details, see:
https://github.com/boonebgorges/buddypress-docs-wiki/issues/8
Don't allow BuddyPress Docs to run theme compatibility mode

cbox-theme provides its own templates for Docs, for the moment at least.

See boonebgorges/buddypress-docs#328
Tweak templates for BP Docs Wiki.
Fix 'New Topic' button for group forums.

bp_is_group_forum() changed in BP 1.7 to check if the legacy forums are
are explicitly installed.  This change broke the visibility of the
button when using the bbPress plugin.

In this commit, we use a customized version of bp_is_group_forum() to
do our group forum check.  Doing this ensures that the 'New Topic'
button will be displayed again when on group forum page.

Fixes #147.
Add missing .php extension to group request membership template.
In Recent Blog Posts widget, do not assume what the site directory is.

Use native BP function - bp_blogs_directory_permalink() - to output the
correct site directory link.

Props @christianwach.  Fixes #153.
fix second level menu visibility as raised in issue 121
Merge pull request #154 from christianwach/master

Fix visibility of second level menus props @christianwach
Let the Joyride Tour CSS abide the rules of the theme CSS!
Add icon for 'Request Membership' group tab.
Remove is_main_site() restriction on homepage widgets and slider.

For those using CBOX Theme on multisite, there was a restriction that only
the main site could utilize the homepage widgets and slider.

This commit removes this restriction.  Thereby, allowing site admins more
freedom to use the CBOX Theme on multiple sub-sites.

Fixes #156.
do not underline link in joyride tour next button
prevent horizontal scrollbars on pages with div.dir-search
fix display of avatars in IE8
fix display of menubar avatar in IE8
add fallback background-color for IE8
fix whats-new avatar for IE8
fixes avatars for group admins & mods and groups home
fix WP Editor styles in forums
Merge pull request #160 from christianwach/master

EDIT: Layout and design fixes