In classifier.py:
========================================================

- Renamed functions to better reflect their purpose/scope.
- Simplified procedure for obtaining the final decision table. Some
matrix operations weren't really necessary since the score for
0-output label is always K - (score for 1-outpu label) where K
is the sum of weights.
- Added tests for some functions.

In classifier_example.py
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- Renamed function calls, according to changes detailed above.
- There is no need to reload the xpl files, since we can copy
the frequency data before doing the iterations.
Changed histogram dtype so it works with floating point data (distributions)
Bugfix: minterm file output didn't work with patterns larger than 32 bits. Moved minterm file function into xplutil.py
Resolved merge conflicts with origin.
Fixing call to write_minterm_file.
Merge branch 'master' of https://github.com/santoscarlos/mestrado

Conflicts:
	classifier.py
	ensemble.py
	test/test_classifier.py