Update for bugfix and new features#13

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sskaje wants to merge 2 commits intodryphp:masterfrom

Commits on Jul 8, 2013

dos2unix; add support for conversion between private key and WIF; change all methods in class Bitcoin static; add new BitcoinException; new checksum() for common usage; update unit test script;
sskaje
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add static declaration
sskaje
committed