Moved parameter parsing into VCardLine.
Added testcase to verify parsing of VCard 2.1 bare types.
Added testcase to verify exception with bare type parameter and VCard 4.0.
Simplified test case.
Moved the parsing of the rest of the raw vcard line into a VCardLine static
method which creates and returns the VCardLine.
Added the beginnings of a set of test cases for VCardLine.
Fleshed out doc comments and tweaked API.