Update composer dependency version for read-only feature.

Merge branch 'nemphys-read-only'

Fix broken modman file from PR colinmollenhour#128

Fix renamed module XML file.

Disable exception logging by default. Use printException for connecti…

…on errors. Track latest abstract lib submodule.

Track credis 1.9.1 (fixes PHP <5.6).

Track php-redis-session-abstract 1.3.5 and Credis 1.9.0 as submodules.

Update libs to work with latest Credis.

Update composer.json

Track latest Credis library (1.8.2).