adds the ability to report last epoch result (#73)

[mikkokotila]

• added the possibility to choose between peak and last epoch for results (experiment log)
• improved testing scripts slightly
• added a parameter reduce_loss to Scan() for the case where a reducer would be used to minimize loss (instead of maximize a metric such as val_acc)

[coveralls]

Pull Request Test Coverage Report for Build 184

• 11 of 11 (100.0%) changed or added relevant lines in 3 files are covered.
• 11 unchanged lines in 3 files lost coverage.
• Overall coverage increased (+0.4%) to 88.551%

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Files with Coverage Reduction	New Missed Lines	%
talos/reducers/reduce_run.py	1	100.0%
talos/reducers/correlation.py	4	94.74%
talos/metrics/performance.py	6	83.78%

Totals
Change from base Build 181:	0.4%
Covered Lines:	727
Relevant Lines:	821

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💛 - Coveralls