Squashed 'theme/zebra/' changes from ba089a9..0f496a7

REVERT: ba089a9 One more change to top nav
REVERT: 6e8e30e Fixed black navbar on page load (zebra)
REVERT: 32de614 Navbar styles: home icon, all caps, smaller type
REVERT: 9c1c7e0 1) pull add'l css styles from LMS into custommenu.css 2) remove nav borders @bunderwood
REVERT: 6253e50 Flatten navigation bar theme & swap for smaller header logo with more margin. @bunderwood
REVERT: f351b9c fixed menu links
REVERT: af2cfad update navbar welcome link to customHomePage from config.php
REVERT: 77c300b added new images for @bunderwood theming
REVERT: 9990280 added errorbox css for maintenance warning
REVERT: e783e6b tweaked after 2.5 upgrade
REVERT: 9ce3860 Update past, future url to use querystring
REVERT: f5d5787 Fix bad merge. updated login header implementation
REVERT: 9da343f Updating 'Current Courses' to use semester query string
REVERT: 9dd4268 Merge branch 'SEBTS_RELEASE' into SEBTS
REVERT: 0c12ca0 added Writing Center menu
REVERT: e5cd8e8 added Writing Center menu
REVERT: 053a751 Merge branch 'SEBTS' of https://github.com/sebts/moodle-theme_zebra
REVERT: a5eb544 Merge branch 'master' into SEBTS
REVERT: 1bcefcd Added STR 4.1
REVERT: 47a261a SEBTS customizations

git-subtree-dir: theme/zebra
git-subtree-split: 0f496a7151b2a74441703feb9e5325b5d6803f7e
Revert to non-customized zebra v2.5.0
SEBTS customizations

Conflicts:
	theme/zebra/config.php
	theme/zebra/layout/general.php
	theme/zebra/style/pagelayout.css
Added STR 4.1
added Writing Center menu
Updating 'Current Courses' to use semester query string
Fix bad merge. updated login header implementation

Conflicts:
	theme/zebra/layout/general.php
Update past, future url to use querystring
tweaked after 2.5 upgrade
added errorbox css for maintenance warning
added new images for @bunderwood theming
update navbar welcome link to customHomePage from config.php
fixed menu links
Flatten navigation bar theme & swap for smaller header logo with more margin. @bunderwood
1) pull add'l css styles from LMS into custommenu.css 2) remove nav borders @bunderwood
Navbar styles: home icon, all caps, smaller type
Fixed black navbar on page load (zebra)
One more change to top nav