Added *.obj ignore
Added highlighting in Emacs for ${...} variables
Removed tab and added . in variable name regexp
Provide an error message on malformed lets. Fixes #807.
Merge pull request #808 from nico/bettererror

Provide an error message on malformed lets. Fixes #807.
Document target^ syntax.

Added a note into the documentation about interesting target^ syntax
Emacs mode: inherit from prog-mode

`prog-mode` ensures a final newline when saving files, which is useful
since ninja fails otherwise.

See `require-final-newline` and `mode-require-final-newline`.
Use a small, standalone testing framework instead of googletest.

Ninja currently uses googletest for testing. That makes building
ninja_test somewhat annoying since it requires that one passes
--with-gtest PATH to configure. It turns out just implementing the bits
of googletest that ninja uses needs about the same amount of code than
making the --with-gtest flag in configure.py work and making googletest
print test results in a way we want (!)

In addition to making configuration simpler, this also makes compiling
tests much faster: On my system, touching src/build_test.cc (the slowest
file to build in ninja) and rebuilding ninja_tests is twice as fast than
without this patch. Building all is noticeably faster too: 5.6s with
this patch, 9.1s without this patch (38% faster).

The most noticeable things missing: EXPECT_* and ASSERT_* don't support
streaming notes to them with operator<<, and for failing tests the lhs
and rhs are not printed. That's so that this header does not have to
include sstream, which slows down building ninja_test almost 20%.
If this turns out to be annoying, we can maybe add it.
Add support for --gtest_filter. The bots need it, and it is a useful flag.
Don't support ? and : for --gtest-filter, a bit simpler.

Let me know if you use these!
Merge pull request #812 from nico/ninjatest

Use a small, standalone testing framework for ninja instead of googletest.
Don't need to install and configure with gtest any more
Merge pull request #815 from sgraham/gtest-tidy

Don't need to install and configure with gtest any more
fix warning
Merge pull request #817 from nico/warn

fix warning
remove more things not needed without gtest
Merge pull request #818 from nico/lesstest

remove more things not needed without gtest
Fix building tests on Windows again.

Turns out gtest was pulling in sys/stat.h, and we were
using stat() through that in tests. This doesn't work
with old MSVCs, so we should probably replace that with
RealDiskInterface in a follow-up.
Merge pull request #819 from nico/win

Fix building tests on Windows again.
Don't print "Recompacting..." message from tests.

Now tests don't print anything. Non-test behavior is unchanged.