Update installation instructions
Fixed most CS errors, with the notable exception to those regarding certain identifiers not being properly named.
Merge pull request #922 from boenrobot/cs-fix

PSR2 CS fixes
Merge branch 'develop' of github.com:phpDocumentor/phpDocumentor2 into release-2.0
Changing alpha to beta notation and add @source to reference implementation
[#895]: Add xml template to easily generate structure files
[#896]: slashes should only be translated to OS-specific variant when writing to disk
[#927]: Show all errors in a file and change property validation
Fix template generation errors
Update changelog
[#915]: Add new generators for methods, constants, functions and properties
Fixed #929: constants with same name were overwritten

Whenever a constant had the same name as another constant in the
same file (but with a different namespace) then the latter would
overwrite the former.

During the fix for this bug I discovered the same behaviour for
functions, classes, interfaces and traits; which were fixed at
the same time.
[#929]: Add changelog
Update submodule due to invalid ref
Fix test
Merge branch 'release-2.0' of github.com:phpDocumentor/phpDocumentor2 into release-2.0
Update submodule
Update submodule
Up version before release to 2.0.0b7
Updates after last release