CRM-15166 - crmCaseType/edit.html - Don't allow deletion of the standard timeline
CRM-15166 - crmCaseType/activitySetDetails.html - Lock the name by default
CRM-15166 - crmCaseType/timelineTable.html - Don't allow removal of the standard timeline's "Open Case".

Note: If (for some bizarre/erroneous reason) an admin added the "Open Case" activity to another
timeline, then it would be reasonable to delete it.
Merge pull request #3897 from totten/master-casetype-tweaks

CRM-15166 crmCaseType - Tighten control over "Standard Timeline" and "Open Case"