PV49 alterations for creation.
Fixing segfault for solc if stdin is given as input file

- Solc should now check its input files and skip them if they don't
  exist or if they are not a valid file
Merge pull request #589 from LefterisJP/solc_stdin_fix

Fixing segfault for solc if stdin is given as input file
fixed solidity not building on macos
user-provided default constructor
removed explicit
Merge pull request #590 from debris/macox_fixes

fixed solidity not building on macos
Merge branch 'develop' of github.com:ethereum/cpp-ethereum into develop
Some (few) tests for the optimizer.
Whitespace change.
Merge pull request #591 from chriseth/sol_optimizerTests

Some (few) tests for the optimizer.
Dynamic gas requirements for premined crypto contracts.
Merge branch 'develop' of github.com:ethereum/cpp-ethereum into develop
Fix for crazy compiler lambda behaviour.
Minor cleanup.