Added a separate agent for using pattern miner without OAC.
Added a separate Atomspace for loading clean test corpus.
Fixed a bug in CMakelist file for pattern miner.
Added the necessary pre-load scm files into corpus Atomspace.
Merge branch 'master' of http://github.com/opencog/opencog into PM
Comment out the pre-load Pattern Miner corpus scm file in embodiment default conf file.
Merge branch 'master' of http://github.com/opencog/opencog into PM
Merge branch 'master' of http://github.com/opencog/opencog into PM
added a customized Atom2String function to make keystring for unified pattern.
Fixed sorting patterns and extra the first gram patterns.
Fixed bugs in find all instances for a pattern.
Fixed variable map problems.
Fixed a bug for avoiding extending a existing link to a pattern .
Removed patternVarMap from HTreeNode again.
Fixed using the right nodes to extend next gram patterns.
Rewritten unit test SCM files for PLN. Only two are active, will activate the rest after testing.
Merge pull request #756 from Alex-van-der-Peet/master

Rewritten unit test SCM files for PLN.
Remove deprecated method decayShortTermImportance and associated references
Merge pull request #757 from cosmoharrigan/sti

Remove deprecated method decayShortTermImportance and associated references
Got more tests to work, still working on the rest.