added function to make binary constraint using hidden variables
added more examples of CSP
renamed mkbinary to something more meaningful, moved it to simpleai.search.csp, added documentation about usage
Merge branch 'binary-constraints' into develop
Merge pull request #47 from alep/develop

Add documentation regarding arc concistency and making a problem binary constraint with hidden variables.
Merge pull request #48 from fjcapdevila/develop

Make BoundedPriorityQueue use internal heap instead of subclassing from list
Merge remote-tracking branch 'upstream/develop' into develop
mk_hidden_variable_representation returns new variables
Merge branch 'binary-constraints-tests-and-variables' into develop
changed documentation
Merge branch 'binary-constraints-tests-and-variables' into develop
Merge pull request #49 from alep/develop

When construction hidden variable representation create a new set of variables, also added some tests.
Inform how to access the web viewer on start, and catch error and close if unable to start
Merge branch 'web-viewer-start-polishing' into develop
Make PEP8 compliant
Make PEP8 compliant
Make PEP8 compliant
Make PEP8 compliant
Make PEP8 compliant
Make PEP8 compliant