drop some redundent, non-exported functions mentioned in #2831 (wait_readable, wait_readable_filter, wait_readavailable)
fix #2850
WINDOWS: Add instructions to install Git to the less recommended directions in the windows readme
Export @deprecate so that package authors can enjoy its goodness

Module scoping doesn't fix this, because unexported macros are deleted. See
https://groups.google.com/forum/?fromgroups=#!searchin/julia-dev/export$20macro/julia-dev/41xe0Cnqbls/m6XqNUr0RtAJ
Keyword arguments for tol and maxiter (#1573)