Added Information_Source to COA and Incident

It was previously missing, which was an oversight.
Merge branch 'issue_43' into version_1.1
Added additional information to Snort test mechanism

* Product_Name
* Event_Filter
* Rate_Filter
* Event_Suppression

The multiplicity on Rule was also changed from 0..1 to 0..many.
Updated annotations for draft release
Updated notice and dates for 1.1 RC, updated URL references in xsi:type annotations
Added CAPEC 2.7 and MAEC 4.1 external schemas. Updated MAEC/CAPEC extensions
Merge branch 'version_1.1' into timestamp
Updated extension annotations referring to CAPEC and MAEC
Merge branch 'version_1.1' into timestamp