add remaining methods

[tomprogers]

Add the other stuff I have planned. Some of this will take a little research.

String methods

• replace() // like String.replace, operates on raw path, returns self

RegExp-facing methods (treats segments as lines unless /g flag)

• TODO: see String methods that take regexes
• test() //> bool? or would it be the string method
• match() //>
• search()
• exec()

Array methods (operate on folders)

• slice()
• splice()
• push()
• pop()
• shift()
• unshift()

Static class methods

• canonicalize( directory, filename, sep ) // resolves './' & '../'
• escape( directory, filename, sep ) // TODO: research what folks will need

[tomprogers]

ppl will want resolve, join, and other familiar functions from Node's FS package

[tomprogers]

1. [ ] restructure the tests
2. [ ] convert internal representation to use folders: []
3. [ ] add these methods