HighriseCompany class created

HighriseCompany class created along with relevant functions. For
example, findAllCompanies and findCompanyById.
Don't use addNote() when calling HighrisePerson::getNotes()

Calling HighrisePerson->addNote() causes the note to be saved back to
Highrise. This is:
1) just plain wrong, and
2) erroneously throws an access exception when you're trying to
(erroneously) update someone else's note.
Fixed debugging messages

Typo'd if(); meant the condition was ignored and the print_r() executed
anyways.
Merge pull request #1 from sonu27/master

Support for companies