Parse numbers that are embedded into sentences

[batterseapower]

The number support added by #6 only does numbers that appear by themselves currently.

I think we should add an underline on the number to indicate which pinyin these items represent. Because there is not direct corrospondence of pinyin to character something like this is needed or the a phrase like 我有4543个朋友们. it's alright in simple sentences but as they get more complicated it gets harded to see what it what.