partial fix for bug #169

Costs should be double, int int.
Merge pull request #170 from linas/cost

partial fix for bug #169
update link-grammer version on installation script
Merge pull request #178 from AmeBel/update-version

update link-grammer version on installation script
change int to double for cost related calls
Merge pull request #179 from AmeBel/bug-fix

change int to double for cost related calls
Integer.toString to Double.toString
Merge pull request #180 from williampma/ToString

Integer.toString to Double.toString