Modified a few error messages in tests/mdist.R.
Merge branch 'master' of github.com:markmfredrickson/optmatch

Conflicts:
	tests/mdist.R
I had made minor edits some time ago to tests/mdist.R.  This was my attempt to merge them back in, without in any real way changing the tests file.  (The only intended change is that a few errors, when thrown, should be a bit more informative.  But these errors shouldn't be thrown except when something has been broken.)
bumping min version to 2.15.1, closes #37
place to check S3 method exporting, closes #38
Update R/makedist.R

Revised two warning messages in makedist.R, both arising in scenarios where user has asked match_on to compute a large number of distances.  They aim to head off two misinterpretations:
1.  either warning might suggest to the user that the matching problem is too large for match_on, as opposed to for fullmatch/pairmatch etc.  Larger distances can take a while to compute, during which the user sits looking at this warning message; she might mistakenly conclude that she's done something to impede match_on, and conclude the software has hit a dead end.  We need to reword to limit this suggestion; here is one possibility.
2. The second of the revised warnings, the warning about large problems that's issued when the user has provided a within argument, may be thrown when the user is moving toward a small enough problem for fullmatch/pairmatch etc, but isn't quite there yet.  Example:

md.hosp <- exactMatch(pr_vcd ~ hosp.code, data=psdata)
md.tmp <- match_on(pr_vcd ~PS.glmer, within=md.hosp, data=pscores)
md.tmp <- match_on(md.tmp, within=caliper(md.tmp, width=.05) )


In these cases it would be nice to avoid suggesting to the user that she's not using match_on correctly, and in general to avoid needlessly alarming her.  Again, open to other ways of doing this.
Merge branch 'master' of github.com:markmfredrickson/optmatch
Fixing (I hope) error message adjustments in tests/mdist.R.
Bug fix in R/matched.R

"unmatched" and "matched" were scrambled.  Unscrambling.  (No time at the moment to check for consequences of this change, e.g. in tests or examples.)
Merge branch 'gpu.optmatch'
using C mahal version as default
match_on.numeric: using - directly, not apply
Adding Josh B to the list of contributors
fixing some Makefile bugs on linux
got rid of the dotProduct helper function to make the C mahalanobisHelper faster, safer, and a bit more memory efficient
Complement to e6d7776e, fixing the saved ouput
Documentation, build process improvements

Added a big header to the Makefile to provide more details on the major tasks
used during development.

All dependencies from CRAN are now installed in .local, whether they exist on
the system or not. This is useful for getting up and running on a fresh box
with all the development dependencies that are not explicitly listed in the
DESCRIPTION file (e.g. testthat for running tests, RItools which is optional).
ignoring vim's tmp file type
installing devtools as build time dependency
convenience task to print out current package name (e.g. optmatch-0.9_7.tar.gz)
Merge branch 'master' of github.com:markmfredrickson/optmatch

Made the same change twice. This version is nicer.
Conflicts:
	Makefile