v0.1.2a2

[yxqd]

Tickets fixed:

• 89 init mantid configuration file

• 91 improve API doc

• 97 new example script starting from numpy arrays

• 100 made example scripts for headless systems

• 101 improve documentation

Tasks to finish

• [x] Update version in _version.py
• [x] Update git tag and push: git tag -a vX.X.X -m 'comment' git push --tags
• [x] In conda recipes, update meta.yaml and build
• [x] Update installation at SNS analysis cluster, "spida" conda env