Remove all (?) traces of impala from source tree
Fix #384: make Dispatcher accept scalar record arguments
Fix false negatives in reference leak testing.

The int pool interned all ints larger than 200 or smaller than -200 as 0!
Merge pull request #604 from pitrou/remove_impala

Remove all (?) traces of impala from source tree
Merge pull request #621 from pitrou/refleak_test_fix

Fix false negatives in reference leak testing.
Merge pull request #620 from pitrou/fix384

Fix #384: make Dispatcher accept scalar record arguments
Merge branch 'master' of github.com:numba/numba into cfunc_lifetime
Tweak comment