add bitcoinjs-lib 0.1.3 and 0.2.0

While bitcoinjs-lib is available through npm, as of 0.2.0 it requires a compile script to produce file suitable for browser use, which the auto update script does not appear to support. I did the build as follows:

    git clone https://github.com/bitcoinjs/bitcoinjs-lib.git
    cd bitcoinjs-lib
    git checkout tags/0.2.0
    npm install
    npm run-script compile

which produces bitcoinjs-min.js with sha256 f40c55b5c83a17508605dac29e82edb6689dfd6a7900efea2aa5ebc5f09c98ca.

0.1.3 includes pre-built bitcoinjs-min.js and bitcoinjs-exit-min.js, which I have simply copied from the build directory in bitcoinjs-lib after checking out that tag:

    git checkout tags/0.1.3

npm test runs without error.