Import training phases through API

[tagazok]

Idea :

• Have a text file with the training phrases

• fuel g intent [options] --training-phrases=training.txt
  Create the intent and add the training phrases

• update existing training phrases
  Update training phrases with new file

[tagazok]

Create the intent and add the training phrases
Should be easy to do

Update training phrases with new file
Delete all current one and replace with new ones?