Turn on three warnings that were on in Pulse but not on for local development. Resolve a large collection of warnings generated by turning on SUSPICIOUS_IMPLICIT_CONVERSIONS which included the three warnings but also apparently extras.

QA:
	No change should be observed.

TESTED=tests still pass
DELTA=155  (48 added, 61 deleted, 46 changed)

git-svn-id: http://google-toolbox-for-mac.googlecode.com/svn/trunk@618 7dc7ac4e-7543-0410-b95c-c1676fc8e2a3