Add contact photos

Included contact photo output in the VCF, base64 encoded. Also
added GPLv2 license file.
Add IM field handling by specific service

Implemented X- vcard fields for IM usernames. Also writing all
IM usernames to the top of the NOTES field, for those contacts
apps which don't yet handle IM fields.
Fix nickname bug

Fixed bug where nickname was not being written, due to
conditional checking wrong field.
Fix deleted contact bug

Added "deleted = 0" to WHERE clause to prevent outputting
deleted contacts.

Also fixed bug for IM fields not being written with Android 2.3
Gingerbread contacts2.db databases. This was due to data.data5
not being used to identify IM service in that version. Now
handled with a default writing the IM field only to the top of
the NOTE field.
Add Title field

Added Title field to vcard.
Update README

Updated README with new dependencies (perl, base64). Removed
known issue regarding IM fields.