#35 GromacsWrapper ≥ 0.7 supports Python 3.4+

[theavey]

Remove Python type check in init;
Update a few old lines in energy_histo;
Fix a few unescaped backslashes in strings

This doesn't add any testing, unfortunately, but it does clarify the dependencies and should allow all functionality for all Python version >=2.7.14.

Fixes #35.

[coveralls]

Pull Request Test Coverage Report for Build 223

• 0 of 4 (0.0%) changed or added relevant lines in 2 files are covered.
• 37 unchanged lines in 3 files lost coverage.
• Overall coverage decreased (-1.8%) to 38.631%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
paratemp/energy_histo.py	0	1	0.0%
paratemp/coordinate_analysis.py	0	3	0.0%

Files with Coverage Reduction	New Missed Lines	%
paratemp/_version.py	1	41.16%
paratemp/energy_bin_analysis.py	6	0.0%
paratemp/energy_histo.py	30	0.0%

Totals
Change from base Build 219:	-1.8%
Covered Lines:	858
Relevant Lines:	2221

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💛 - Coveralls