Merge pull request #86 from nicksavers/master

Pretty print for JSON dump and cleanup gitignore
Merge pull request #87 from nicksavers/vmfix

Pre-calculation of gas cost before execution of operation
Merge pull request #88 from nicksavers/vmfix

Guard CALL against high initial gas price and overflow
Reward correctly when there are uncles
Workaround overflow bug in poc5
Merge pull request #89 from nicksavers/master

Add correct rewards with uncles and workaround overflow for PoC5
added custom json generator
Merge pull request #90 from negedzuregal/parser

Custom json generator
VM: tracing fix
+ get back the log for memory/stack/storage
   on vm trace level.
Trie work
+ nice string for nibbles