impl submapper

refactor submapper and add test case for submapper.
add commited author in document
add Nephia::Request
embed Nephia::Request to Nephia::Core and fix test
add test for Nephia::Request
depend on URL::Encode for parse query string
add test cases
update .travis.yml for coveralls
Merge pull request #26 from Songmu/feature/coveralls

update .travis.yml for coveralls
Merge pull request #25 from Songmu/feature/nephia-request

Feature/nephia request
Merge pull request #24 from mackee/submapper

impl submapper