v0.6.0b3 release

[coveralls]

Pull Request Test Coverage Report for Build 453

• 259 of 298 (86.91%) changed or added relevant lines in 25 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.8%) to 83.847%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
aiida_crystal17/gulp/parsers/parse_output.py	9	11	81.82%
aiida_crystal17/gulp/parsers/write_input.py	12	14	85.71%
aiida_crystal17/data/symmetry.py	2	6	33.33%
aiida_crystal17/workflows/symmetrise_3d_struct.py	18	24	75.0%
aiida_crystal17/gulp/parsers/parse_main.py	19	28	67.86%
aiida_crystal17/gulp/data/potential.py	40	56	71.43%
<!--	Total:	259	298	86.91%	-->

Totals
Change from base Build 425:	0.8%
Covered Lines:	3452
Relevant Lines:	4117

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💛 - Coveralls