Adds sum formula function to PG cartridge.

	* Function signature equivalent to Python interface's CalcMolFormula().
	* Only defined for Postgres 9.x but should work on 8.x too.
allow completely disabling the use of flex and bison
allow extra args to be passed to AllChem.ConstrainedEmbed
Merge branch 'pg-add-mol_fmla' of https://github.com/janholstjensen/rdkit into janholstjensen-pg-add-mol_fmla
rename fmla->formula
Fixes #189
add the java wrappers to the travis build
add the java wrappers to the travis build part 2
add the java wrappers to the travis build part 3
add the java wrappers to the travis build part 4
add the java wrappers to the travis build part 5
more travis and java
Fixes #233
remove the java tests since I cannot seem to make them work
Fixes #234
Fixes #235
copy over conformers too. Part of #234