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Seperate want list into differentiated types - session tracking and regular

fix #13

Breakup Startup function so that wantlists are not sent with each call to SendMessage

fix race conditions while setting up wantlists by creating peer queues on demand

BREAKING CHANGE: PeerManager SendMessage signature changed

fix #51

Also, buffer single-use channels we may walk away from. This was showing
up (rarely) in a go-ipfs test.

per https://github.com/golang/go/wiki/CodeReviewComments#comment-sentences

Finishing adding comments to WantManager and PeerManager, refactor message structure for type
safety, add sending messages test

Seperates the functions of tracking wants from tracking peers
Unit tests for both peer manager and want manager
Refactor internals of both to address synchonization issues discovered
in tests

Extract session manager from bitswap
Extract session manager & want manager to package
Move want manager message queue to seperate file
Move Message Queue to subpackage
Respond to PR Comments