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test(symbols): Do not count hidden symbols

Closes #792
fix(dirty-checking): fix removal of watch record on disconnected group.
fix(tagging-compiler): support top level comments
style: code cleanup
fix(filters): pass filters to all evals

closes #755

Ad support for '"s" + ("m"|filter) + "e"'
fix(scope) fix stats
feat(AstParser): Made the AST parser private to the scope

relates to #648
fix(scope): allow watching an empty string
fix(change-detection): When two identical pure functions removed

Fixes #787
Closes #788
style: code cleanup
feat(ngRepeat): make use if the new change detection

closes #728
relates to #645
refactor(test): group input type=number tests

Move input type=number tests from the type=text group into the
type=number group.

Closes #789
refactor(Scope): Change how time is measured and results emitted.

Scope uses three different set of stopwatches to measure time during
digest, flush and assert flush phase. The results are emitted using an
emitter.