Updated plugin form setting fields.

Resolved #19. Merged CAS parameters (Hostname, Port, path) into one field.
Wrote a parsing function to parse the new field. Same for LDAP parameters.

Conflicts:
	wordpress-cas-client.php
Merge pull request #41 from TriptiSharma/issue-19

Verified that LDAP URI is including LDAP when not included, port is being added, CAS Server is listed as URI,  CAS.php path is being auto populated,.  However, CAS.php is not being saved unless user hit the save button. This exposes a problem because CAS plugin won't work (see issue #44).
Merge branch 'dev' of https://github.com/BellevueCollege/wordpress-cas-client into issue-40

Conflicts:
	wordpress-cas-client.php

Merged my changes with recent changes made by other developer.
Merge pull request #42 from shawn-bellevuecollege/issue-40

Merge changes fix "LDAP User" and "LDAP Password" fields being saved in
single site installations. This problem does not show up in multisite
installations.

Additionally a new bug under single site installations was discovered
where "CAS Server URI" and "LDAP URI" fields are not being saved. This
bug will be filed separately.