STY: remove unused imports.
REF: add a dylib with placeholder hack in LC_DYLIB.
REF: extract targets computation in separate function.
REF: remove unused alt_replace_func.
REF: remove unused code.
REF: remove object_code shared module state.
REF: small test cleanups.
BUG: fix legacy lc_dylib locaion.
Merge pull request #275 from enthought/fix_macho_global_state

Fix macho global state
REF: remove unused code.
MAINT: update license.
Merge pull request #276 from enthought/remove_unused_code

REF: remove unused code.
REF: remove unused import.
REF: don't use urllib2 for auth anymore.
FEAT: add proxy_dict property to config for requests.
REF: use proxy_dict in URLFetcher.
FEAT: use proxy if configured when authenticating.
Merge pull request #277 from enthought/remove_urllib2_usage

Remove urllib2 usage