Add a travis configuration file.

It builds the library and examples for mode=small, hse=25000000,
and three of the supported MCUs.
Initial cut of generating a cmake find script.
Remove include prefix from #includes in config/rcc.h
Default installdir in subdir of local.
Path and spacing fixes.
Merge branch 'adc' of https://github.com/andysworkshop/stm32plus into install-headers
Merge branch 'andy-master' into cmake-config

Conflicts:
	lib/SConscript
directory versioning
Merge branch 'cmake-config'

Conflicts:
	SConstruct
INSTALLDIR_INCLUDE_PREFIX -> INSTALLDIR_PREFIX
Merge branch 'install-paths' into cmake-config
Fixes from upstream path changes.
Further refine cmake script, now support versioned include.
Add STM32PLUS_BUILD flag automatically in cmake config.
Add a very simple example cmake project.
Remove duplicated documentation from SConstruct file.
Indent the additional notes to better match the other usage output, add a sentence about installing multiple versions.
Merge pull request #40 from mikepurvis/doc-dedup

Doc deduplication in SConstruct
restructuring internally
latest features, refactored a litle