Add maven support for bitcoinj.
Add maven support for bitcoinj.

After this CL, you can use "mvn install" to build / test the project.

FTraian/bitcoinj-uc,Coinomi/bitcoinj,praus/multicoinj,haxwell/bitcoinj,natzei/bitcoinj,therightwaystudio/fork_bitcoinj,dldinternet/bitcoinj,HashEngineering/mobilecashj,HashEngineering/digitalcoinj,mrosseel/bitcoinj-old,patricklodder/libdohj,HashEngineering/groestlcoinj,HashEngineering/quarkcoinj,veritaseum/bitcoinj,janko33bd/bitcoinj,yezune/darkcoinj,rnicoll/libdohj,VegasCoin/vegascoinj,HashEngineering/megacoinj,HashEngineering/infinitecoinj,devrandom/bitcoinj,natzei/bitcoinj,HashEngineering/mobilecashj,cannabiscoindev/cannabiscoinj,cannabiscoindev/cannabiscoinj,dexX7/bitcoinj,patricklodder/bitcoinj,HashEngineering/groestlcoinj,yezune/darkcoinj,Coinomi/bitcoinj,GroestlCoin/groestlcoinj,rootstock/bitcoinj,bankonme/monetaryunitj,bitcoin-solutions/bitcoinj-alice,stafur/trustpluscoinj,HashEngineering/maxcoinj,blockchain/bitcoinj,VegasCoin/vegascoinj,HashEngineering/frankoj,TheBlueMatt/bitcoinj,bitbandi/spreadcoinj,HashEngineering/unobtaniumj,bitsquare/bitcoinj,HashEngineering/digitalcoinj,jife94/bitcoinj,funkshelper/bitcoinj,patricklodder/bitcoinj,patricklodder/libdohj,HashEngineering/quarkcoinj,bankonme/monetaryunitj,greenaddress/bitcoinj,jjculber/defcoinj,langerhans/dogecoinj-new,rnicoll/bitcoinj,marctrem/bitcoinj,HashEngineering/dashj,meeh420/anoncoinj,cpacia/bitcoinj,GroestlCoin/groestlcoinj,paulminer/bitcoinj,veritaseum/bitcoinj,DynamicCoinOrg/dmcJ,rnicoll/altcoinj,techsubodh/admin_tracker,HashEngineering/myriadcoinj,RaviAjaibSingh/bitcoinj,techsubodh/admin_tracker,FTraian/bitcoinj-uc,Rimbit/rimbitj,jdojff/bitcoinj,imzhuli/bitcoinj,fsb4000/bitcoinj,dalbelap/bitcoinj,haxwell/bitcoinj,MonetaryUnit/monetaryunitj,stonecoldpat/bitcoinj,ahmedbodi/anycoinj,DigiByte-Team/digibytej-alice,HashEngineering/unobtaniumj,Kefkius/groestlcoinj,HashEngineering/maxcoinj,cpacia/bitcoinj,DigiByte-Team/digibytej-alice,habibmasuro/smileycoinj,HashEngineering/dimecoinj,framewr/bitcoinj,langerhans/dogecoinj-alice,bitbandi/spreadcoinj,patricklodder/libdohj,danielmcclure/bitcoinj,jdojff/bitcoinj,MintcoinCommunity/mintcoinj,stafur/trustpluscoinj,HashEngineering/darkcoinj,jdojff/bitcoinj,kmels/bitcoinj,coinspark/sparkbit-bitcoinj,tangyves/bitcoinj,Kefkius/groestlcoinj,Kefkius/groestlcoinj,RobKohr/bitcoinj,oscarguindzberg/bitcoinj,oscarguindzberg/bitcoinj,MrDunne/bitcoinj,haxwell/bitcoinj,habibmasuro/smileycoinj,hughneale/bitcoinj,cbeams/bitcoinj,dogecoin/libdohj,schildbach/bitcoinj,keremhd/mintcoinj,hank/litecoinj,kris-davison/non-working-darkcoinj-fork,HashEngineering/darkcoinj,you21979/bitcoinj,RobKohr/bitcoinj,lavajumper/bitcoinj-scrypt,HashEngineering/dimecoinj,ahmedbodi/anycoinj,HashEngineering/namecoinj,bitbandi/spreadcoinj,wpstudio/blazecoinj,kurtwalker/bitcoinj,kurtwalker/bitcoinj,HashEngineering/groestlcoinj,HashEngineering/maxcoinj,jife94/bitcoinj,HashEngineering/maxcoinj,troggy/bitcoinj,ohac/sha1coinj,habibmasuro/smileycoinj,cannabiscoindev/cannabiscoinj,peterdettman/bitcoinj,tjth/bitcoinj-lotterycoin,HashEngineering/dimecoinj,you21979/bitcoinj,TheBlueMatt/bitcoinj,HashEngineering/dashj,yenliangl/bitcoinj,HashEngineering/digitalcoinj,stonecoldpat/bitcoinj,kris-davison/non-working-darkcoinj-fork,imsaguy/bitcoinj,bitbandi/spreadcoinj,TrustPlus/trustpluscoinj,reddcoin-project/reddcoinj-pow,HashEngineering/frankoj,MikeHuntington/blackcoinj-new,VegasCoin/vegascoinj,FTraian/bitcoinj-uc,HashEngineering/megacoinj,devrandom/bitcoinj,schildbach/bitcoinj,langerhans/bitcoinj-alice-hd,bitcoin-solutions/bitcoinj-alice,janko33bd/bitcoinj,Kefkius/groestlcoinj,habibmasuro/litecoinj,TrustPlus/trustpluscoinj,Enigmachine/btcjwork2,HashEngineering/frankoj,cannabiscoindev/cannabiscoinj,HashEngineering/myriadcoinj,MintcoinCommunity/mintcoinj,bankonme/monetaryunitj,tjth/bitcoinj-lotterycoin,AugieMillares/bitcoinj,Kangmo/bitcoinj,you21979/bitcoinj,HashEngineering/digitalcoinj-mb,MonetaryUnit/monetaryunitj,yezune/darkcoinj,ligi/bitcoinj,fsb4000/bitcoinj,HashEngineering/maxcoinj,fsb4000/bitcoinj,UberPay/bitcoinj,HashEngineering/anycoinj,stonecoldpat/bitcoinj,TheBlueMatt/bitcoinj,bitcoinj/bitcoinj,tangyves/bitcoinj,HashEngineering/namecoinj,MintcoinCommunity/mintcoinj,VishalRao/bitcoinj,bitcoin-solutions/bitcoinj-alice,MonetaryUnit/monetaryunitj,techsubodh/admin_tracker,hank/litecoinj-new,nikileshsa/bitcoinj,HashEngineering/dashj,jife94/bitcoinj,reddcoin-project/reddcoinj-pow,designsters/android-fork-bitcoinj,monapu/monacoinj-multibit,PeterNSteinmetz/peternsteinmetz-bitcoinj,stafur/trustpluscoinj,Crypto-Expert/digitalcoinj,kmels/bitcoinj,HashEngineering/unobtaniumj,paulmadore/woodcoinj,sserrano44/bitcoinj-watcher-service,kurtwalker/bitcoinj,pelle/bitcoinj,HashEngineering/mobilecashj,TrustPlus/trustpluscoinj,strawpay/bitcoinj,Kefkius/groestlcoinj,dcw312/bitcoinj,stafur/trustpluscoinj,kris-davison/non-working-darkcoinj-fork,HashEngineering/namecoinj,szdx/bitcoinj,HashEngineering/quarkcoinj,Qw0kka/creditsj,DigiByte-Team/digibytej-alice,lavajumper/bitcoinj-scrypt,ahmedbodi/anycoinj,peacekeeper/bitcoinj,bitbandi/spreadcoinj,lavajumper/bitcoinj-scrypt,devrandom/bitcoinj,HashEngineering/dashj,tjth/bitcoinj-lotterycoin,GroestlCoin/groestlcoinj,veritaseum/bitcoinj,cpacia/bitcoinj,hank/feathercoinj,bitcoinj/bitcoinj,akonring/bitcoinj_generous,tangyves/bitcoinj,yezune/darkcoinj,peterdettman/bitcoinj,yenliangl/bitcoinj,HashEngineering/megacoinj,Coinomi/bitcoinj,novitski/bitcoinj,patricklodder/bitcoinj,reddcoin-project/reddcoinj-pow,HashEngineering/darkcoinj,HashEngineering/myriadcoinj