[uportal-dev] Switching to SLF4j & logback for 4.1

[Eric Dalquist]

I'd like to switch from commons-logging + log4j to slf4j + logback in 4.1. SLF4j has bridge APIs so no code needs to change just our pom and logging config. Logback is easier to configure and includes a java.util.logging bridge which is handy for a few libraries we use. I have the work done in a branch here: https://github.com/Jasig/uPortal/compare/master...UP-3531_logback

-Eric

I'll plan on merging that into 4.1 next week unless there are any objections.

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