Fix unintialized memory access

• Remove false-positive Apache-exploit (Fixes #79). #80

• readable-stream@3 #57

• Add indexOf docs #60
• fix empty shallowSlice return #65

• use ES3 only #62

• Use native indexOf whenever possible #61

• Added indexOf #59

• Use require('readable-stream').Duplex #56

• Added support for readUIntLE and companions #55

• use safe-buffer #51