Reduce Travis verbosity and remove most LGTM issues

[andrrizzi]

Fix #234 and remove almost all LGTM issues. The remaining LGTM issues are related to environment.py, which we're not sure if it will kept around, and gbsaforces.py, which I believe is still largely unsupported.

[j-wags]

This pull request introduces 1 alert and fixes 61 when merging a8205cc into 0b4c523 - view on LGTM.com

new alerts:

• 1 for Unused local variable

fixed alerts:

• 17 for Unused import
• 13 for Unused local variable
• 11 for Testing equality to None
• 10 for Unreachable code
• 6 for 'import *' may pollute namespace
• 1 for Use of the return value of a procedure
• 1 for Suspicious unused loop iteration variable
• 1 for Module is imported with 'import' and 'import from'
• 1 for Variable defined multiple times

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Comment posted by LGTM.com

[j-wags]

This pull request fixes 61 alerts when merging a3c1ad2 into 0b4c523 - view on LGTM.com

fixed alerts:

• 17 for Unused import
• 13 for Unused local variable
• 11 for Testing equality to None
• 10 for Unreachable code
• 6 for 'import *' may pollute namespace
• 1 for Use of the return value of a procedure
• 1 for Suspicious unused loop iteration variable
• 1 for Module is imported with 'import' and 'import from'
• 1 for Variable defined multiple times

---

Comment posted by LGTM.com

[codecov-io]

Codecov Report

Merging #258 into master will increase coverage by 1.67%.
The diff coverage is 57.4%.

@@            Coverage Diff             @@
##           master     #258      +/-   ##
==========================================
+ Coverage    73.1%   74.78%   +1.67%     
==========================================
  Files          17       17              
  Lines        5128     5012     -116     
==========================================
- Hits         3749     3748       -1     
+ Misses       1379     1264     -115

Impacted Files	Coverage Δ
openforcefield/utils/serialization.py	91.3% <ø> (+6.45%)	⬆️
openforcefield/typing/engines/smirnoff/io.py	64.07% <100%> (-0.35%)	⬇️
...enforcefield/typing/engines/smirnoff/forcefield.py	67.84% <100%> (+0.12%)	⬆️
openforcefield/topology/topology.py	71.34% <100%> (+0.1%)	⬆️
openforcefield/utils/utils.py	91.13% <100%> (+0.05%)	⬆️
openforcefield/topology/molecule.py	86.24% <33.33%> (+2.38%)	⬆️
openforcefield/utils/structure.py	43.59% <50%> (ø)	⬆️
openforcefield/typing/chemistry/environment.py	62.11% <66.66%> (+0.06%)	⬆️
...enforcefield/typing/engines/smirnoff/gbsaforces.py	21.95% <66.66%> (-2.76%)	⬇️
openforcefield/utils/toolkits.py	86.43% <66.66%> (+5.71%)	⬆️
... and 1 more

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[jchodera]

Wow, awesome!

[jchodera]

Looks good! Test verbosity is much better now.

[andrrizzi]

Thank you!