Filter by priority

[seconddayout]

As the app is, it seems one cannot filter the results of tb -l by priority level.

I'd expected to be able to do the following:

• tb -l p:3 to get all tasks with a priority level of 3 across all boards
• tb -l p:<3 to get all tasks with a priority level of less that 3 (1s and 2s) across all boards
• tb -l p:>1 to get all tasks with a priority level of greater than 1 (2s and 3s) across all boards
• tb -l p:2,3 same as above
• tb -l p:2 p:3 same as above
• tb -l p:1,3 to get all tasks with a priority level of 1 or 3 across all boards
• tb -l p:1 p:3 same as above

[runyasak]

I have PR to filter by priority. But can handle equal cases, tb -l p:<priority>. For more information, please checkout on this PR #136 .