added ringtone file
basic implementation of ringtone
refactored Call model to accept an options object
merge with ignore-a-call branch
sync with master
decoupled ringtones from the Call model
added tests for utils.AudioLibrary
updated tests for the Call model
chat app: better reuse of existing patterns for subscribing to call events
jsdoc
added audio events for outgoing call
added tmp outgoing call sound (same as incoming one)
updated outgoing call sound
fixed AudioLibrary jsdoc
fixed text chat tests were playing actual sounds
sync with master
sync with master
fixed frontend tests after merges
Merge pull request #126 from n1k0/ringing-tone

Add ringing tones
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