Update helpers-strings.js with plusify function

Plusify helper replaces spaces with plus signs.
Modified strings_test.js with plusify tests
Modified helpers-strings.js with inline plusify documentation
Modified docs to include plusify function
Merge pull request #126 from stephenway/patch-1

Update helpers-strings.js with plusify function
bumping version
@trivial fixed link in README
Merge pull request #133 from dwabyick/master

@trivial fixed link in README
convert tmpl.md to .verbrc
get verb working
fixes link
Merge pull request #135 from makotot/verb

Convert docs to use verb
Fix broken link in README

See issue #139
remove readme task
Merge pull request #141 from makotot/readme

remove readme task
Allow passing object to stringify, resolves #145
Add test for passing an object to stringify
Merge pull request #146 from backflip/master

Allow passing object to stringify, resolves #145
0.5.6
bumping node version