Merge branch 'hotfix/870'

Fix rendering issue in table
fix typos
Update zend.mail.attachments.rst

Rewrote the whole page since it was just a copy of ZF1 docs with namespaces.
correct some class names
saveAlbum() accepts Album class, not an array
Closed ')'
Merge branch 'hotfix/#880'

Close #880
Merge branch 'hotfix/#880' into develop

Close #880
Merge branch 'patch-1' of https://github.com/nikai3d/zf2-documentation into hotfix/#873
Merge branch 'hotfix/#873'

Close #873
Merge branch 'hotfix/#873' into develop

Close #873
Merge branch 'patch-3' of https://github.com/gennadiylitvinyuk/zf2-documentation into hotfix/#881
Merge branch 'hotfix/#881'

Close #881
Merge branch 'hotfix/#881' into develop

Close #881
Add documentation for NumberParse filter

Related to zendframework/zf2/#4493 and zendframework/zf2#4510
Update service manager config key for the identity plugin()

'alias' key should be 'aliases'
Fixed validator listing and attaching.
Update for "Using Zend\Navigation in your Album Module"

- line numbers to code examples added
- links to component and view helper added
- small updates for code examples
Updates for "Using Zend\Paginator in your Album Module"

- links to components added
- format for SQL code fixed
Typos fixed