Merge pull request #1 from mrDarcyMurphy/init

Init
added positiveInteger, negativeInteger, and zero methods
Merge pull request #2 from mrDarcyMurphy/int-mods

added positiveInteger, negativeInteger, and zero methods
comment
use shorthand
add string and empty string methods
tests
add .jshintrc
add missing comma
whitespace
version bump
string tests
whitespace
Merge pull request #3 from mrDarcyMurphy/assertions

String Checking
add void check
v0.0.3
Merge pull request #4 from mrDarcyMurphy/void

Void
test posInt and negInt with an additional argument
add arguments to pos and neg int methods
new emptyString alias