Add ledger formula to OS X install instructions
[ci skip]
Minor fix: double spaces
query is a command
pxref already contains "see"
Fixes for consistency
Fixes:
- typo fixes
- @keywords consistency fixes
- add some @kindex and @cindex
- buffer names highlighted as @file{}
- menu item highlighted as @samp{}
M-x delete-trailing-whitespace
Document that buffer names should use @file{} keyword
Indented with Emacs: M-x fill-paragraph
Merge pull request #344 from thdox/fix-doc

Fix doc
Merge pull request #342 from afh/pull/readme

Add ledger formula to OS X install instructions
Fix crash when using --trace 10 or above

uint8_t is typedef'd to char, thus boost::lexical_cast treats it
as such instead of a number.
Set CMake policy CMP0042

to remove the warning below when running cmake.
In the long run changing the CMake rules to set MACOSX_RPATH
might be the better option.

  CMake Warning (dev):
    Policy CMP0042 is not set: MACOSX_RPATH is enabled by default.  Run "cmake
    --help-policy CMP0042" for policy details.  Use the cmake_policy
    command to set the policy and suppress this warning.
    MACOSX_RPATH is not specified for the following targets:

     libledger

  This warning is for project developers.  Use -Wno-dev to suppress it.
Ignore vim swap files
[ci skip]
[test] Use --args-only option in DocTests.py

instead of --init-file /dev/null
[travis] Run Travis build when .travis.yml changed

- Change match pattern to include ^\.travis.yml
- Add executable file permissions for tools/prepare-commit-msg
[ci skip]
[travis] Shorten Travis CI run times

by adding --jobs to utilize multiple cores and using boost ppa packages
instead of downloading the source and building boost from scratch.

This effectively cuts the time for a Travis CI run in half.
Merge pull request #351 from afh/pull/git-hook

[travis] Run Travis build when .travis.yml changed
Merge pull request #352 from afh/pull/travis

[travis] Shorten Travis CI run times
Merge pull request #349 from afh/pull/DocTests

[test] Use --args-only option in DocTests.py