Support IP2Proxy Web Service.

Removed unused code.

Added provider field and exception handling for incorrect BIN database.

Merge pull request ip2location#5 from ip2location/3.1.2

3.1.2

Delete lookup.py

Removed wrong file.

Fixing bug.

Update setup.py

Added missing symbol.

Reduce File I/O

Merge branch 'master' of https://github.com/ip2location/ip2proxy-python

Initial commit.