Merge pull request #29 from devxoul/travis-lint-line-length

Add line length linter
Merge pull request #30 from devxoul/travis-lint-line-length

linter: Separate extension string from command
Merge pull request #31 from devxoul/travis-lint-line-length

Update linter
Merge pull request #32 from devxoul/travis-lint-line-length

Use gawk instead of awk for calculate multibyte characters length
Shorten code to pass testing.