Add Network settings, support multisite installations

1. Resolved #1 - Checks multisite flag, if set, networks settings override
   local settings.
2. Resolved #9 - Replaced get_settings with get_option, Replaced
   capability(was set to '8') parameter in 'add_submenu_page' and
   'add_options_page' functions with variable name(i.e. name of the
   capability).
3. Partly worked on Brand Plugin feature
	- Updated error messages
	- Updated title of the plugin in menu.
Update branding to match new plugin name

This resolves #2

Fixes include:
* Rename plugin file name
* Update labels and field names
Merge pull request #1 from esteen/dev

Update branding to match new plugin name
Add multisite check to local menu creation.
Fix user role is reset upon login. Resolve #26

== Note from Issue #26 ==
Currently when logging into wordpress using CAS with LDAP enabled the
user's roll is always set to the hard coded value of
"$defaultEmployeeUserrole" or "$defaultStudentUserrole" depending which
role the user matches.

These values should be used the first time the user logs in, but if the
user role is changed by an WordPress administrator the plugin should
not modify the user's role.
Merge pull request #30 from jonathanwindle/tripti-13

Fix issues #1, #2, and #26
Update language internationalization

Resolved #15

* Update .pot file with current internationalization options
* Rename lang folder to language to meet current WordPress standards
Merge pull request #31 from jonathanwindle/issue-15

Update language internationalization
Resolve #24 - Update options button now says save
Resolve #22 - fix type on default role
Resolve #21 - Rename settings menu to CAS Client
Merge pull request #32 from esteen/dev

Resolves #21, #22, #24