Merge branch 'release/v0.6.0' into develop

* release/v0.6.0:
  Bumps version
Add donation address
Add note about dev box
Do some initial renaming of BitcoinTestnet to BitcoinCleaner
Rename files and folders from testnet to cleaner
Remove spec/testnet submodule

We will no longer need the testnet with the new regtest functionality of
bitcoind
Update changelog with BitcoinCleaner changes
Update license date
fixup to rename file contents
Use -regtest switch on bitcoind instead of the testnet
prepare v1.0.0.beta.1
Merge branch 'release/v1.0.0.beta.1'

* release/v1.0.0.beta.1:
  prepare v1.0.0.beta.1
  Use -regtest switch on bitcoind instead of the testnet
  fixup to rename file contents
  Update license date
  Update changelog with BitcoinCleaner changes
  Remove spec/testnet submodule
  Rename files and folders from testnet to cleaner
  Do some initial renaming of BitcoinTestnet to BitcoinCleaner
  Add note about dev box
  Add donation address