Work with node 0.10.x
Stop calling node-waf explicitly

We need to use node-waf or node-gyp depending on the situation.
This should make npm to take care of it.
Add 0.8 and 0.10 to travis test target
We need to specify Node 0.10 in string

Otherwise, travis recognized as '0.1'.
Even so it still works because 'nvm use 0.1' actually uses node
0.10.x.
Merge pull request #2 from darashi/node-0.10.x

Support Node 0.10.x