This version changes internal structure of BigFileTools
- docs: much better description of what is going on in this library
- clean up: library is now divided into drivers
- architecture: uses Dependency Injection
- auto-loading: now using PSR-4
- fix: native read driver had incorrect results for files under 2GB
- fix: exec driver now works with empty files
- now only PHP >=5.6 is supported (this is due to usage of brick/math that is used for mathematical computations)