* Got outline of tests for squeak core methods
* Split squeak core test fixtures into seller and buyer
* Add unit tests for decrypt content from sent payment in squeak core
* WIP: most of timeline db query test
* Got unit test for timeline query working with followed profile
* Remove old commented create signing profile function
* Create test utils module for unit tests
* Improve squeak db unit tests using generated block header object
* Add assertion for block time in get squeak entry test
