improved readme

- link to the Composer homepage (much more useful for beginners)
- do not require changing the version (that has been horribly outdated) on every new minor release
- warn about the evilness of dev-*
- moved Composer autoloading note (it was misleading in the GitHub section, as cloning the repository and then including the project's Composer autoloader will *not* make it load raven-php)
added patch from m8rge (issue #103)
Merge pull request #114 from webvariants/readme

improved readme
Merge pull request #115 from webvariants/autoloading-phpbug

added patch from m8rge (issue #103)
make SanitizeDataProcessor parameters dynamic, improve default values
Merge pull request #116 from erusev/master

make SanitizeDataProcessor parameters dynamic, improve default values
Enforce rebase
Correct processors tests to match static behavior
Ensure certain values do not get sent as empty (invalid) numeric arrays
Bring user interface up to spec and switch to protocol version 3
Slight tweaks towards http request detection (refs GH-113)
Remove php 5.3 syntax from PHPUnitUtil
Add missing secret key to header
setAccessible only works on 5.3 (uh oh)
Scrap protected methods
private -> protected, and removal of signatures
0.7.0
Support precision-based timeouts only when they are available (fixes GH-76)
0.7.1
Optimize error level filtering by usung bit comparison