Configure Boost with autoconf macros

This commit fixes the build failure `library not found for -lboost_thread` on
OS X / Homebrew and improves build.
Merge pull request #18 from seanchas116/fix-boost

Configure Boost with autoconf macros
Improve .gitignore

Adds some files to .gitignore.
Add travis.yml
Merge pull request #19 from seanchas116/improve-gitignore

Improve .gitignore
Add travis on README
Remove lldb,clang
Improve .gitignore

Adds some files to .gitignore.
Add travis.
Merge branch 'master' of github.com:tomoki/Shiranui

Conflicts:
	.travis.yml
fix .travis.yml
Add pre,post condtion,invariant.
Fix broken English a little.
Fix https://github.com/tomoki/Shiranui/issues/24
Remove send_flyline_sub and make it lambda.
show "Max call-depth exceeded"
Fix https://github.com/tomoki/Shiranui/issues/21
Fix logo a little.