indexer for RDF data
git ignores for generated sources and exe
fix error on cli args for test_query
add RDF prefixed output for at least the built-in vocabularies

this is hacked together on URIs because for some reason
Raptor doesn't give you the prefixes on a Reader. I would
like to get the prefixes from a Reader to apply directly to the Writer
disable sp2bench that are not supported by compiler

Two main problems
Joins with $0 != $1
condition flip (see issue #104)
add manually expanded RDF strings to sp2b
add manually expanded RDF strings to sp2b
change grappa padding to GRAPPA_BLOCK_ALIGNED
Merge branch 'bmyerz-sp2bench-c' of github.com:uwescience/datalogcompiler into bmyerz-sp2bench-c

Conflicts:
	examples/sp2bench/sp2bench_rdf.py
sp2b for grappa
disable the remove project rule in favor of GrappaProject
cleanup strings2ints, print indices for human readability
Merge branch 'bmyerz-sp2bench-c' of github.com:uwescience/datalogcompiler into bmyerz-sp2bench-c
add sympy to auto-installable requirements
antijoin comment
remove double call to compile_boolean in boolean_combine

compile_boolean() already is called in BinaryOp case.
Otherwise it messes up the visitor pattern.
boolean expression visitor and use it to refactor compile_boolean
undo 1bda0dd
forgot the EQ abstract visit method
ignore some generated data files for clang tests