Merge branch 'dev'

Merge pull request #18 from whyjz/dev

Update dhdt module

Merge pull request #15 from whyjz/v2

v2.0.0a1

Add URL support for SingleRaster #2

Merge pull request #11 from whyjz/px_v1.0

Fixed small bugs

Merge pull request #9 from whyjz/px_v1.0

Finalizing Pixel Track 1.0 Documentation

Merge pull request #7 from whyjz/dhdt_v1.0

Dhdt v1.0

Andrew's initial version 0.1