Merge pull request #20 from zolkis/gh-pages

Issue #4, emergency dial, added acks
Removed extending call handler
Moved the call hanlder interface to its own section (closes #38)
Added TelephonyCall implements CallHandler, fixed headings
removed redundant text about CallHandler objects
Linked to implement definition in WebIDL
Fixed headings, moved implements IDL statements
removed mention of CallHandler
Moved text about supported specs (closes #25)
Made DTMF a citation (closes #37)
Removed RFC2119 words from statements of fact (closes #24)
Moved text about TelephonyManager to right section (closes #29)
Moved text to appropriate section (closes #31)
Merge pull request #22 from zolkis/gh-pages

handling issue #21
fixed merge conflict
fixed merge conflict
Removed generic error catch all and redef of exception types (closes #39, #40)
Added ref to JINGLE
Revert "Added ref to JINGLE"

This reverts commit 5632415a749734b02cbb4e4d25518c433954beee.
Added ref to JINGLE - (closes #42)