Aug 12, 2018

# 3.3.1
- Supported EULER constant for graph
- Supported format big number
- Added more statistical functions and document

# 3.3.0-alpha
- Support solve cubic inequality and quartic inequality
- Vector D variable
- PDF and CDF functions
- Updated document
- Improve user interaction

# 3.2.7-alpha
- Reduce size of application
- Exponent and NRoots functions
- Fixed crash when rotate on some devices
- Support disable g(x)
- Fixed can not delete history