Merge branch 'release/0.4.2' into develop
add shasum check (fixes #14)
change shasum to sha1sum (RHEL systems don't have shashum command)
switch shasum and sha1sum
Fixed install_python.sh's bug.

- Fixed shebang.
- Added PATH.
Merge pull request #17 from gwtnb/python

Fixed install_python.sh's bug.
update to Jubatus version 0.4.3

+ change library version:
  - pficommon (473401)
  - jubatus_mpio 0.4.2
Merge branch 'release/0.4.3'