Drop M2E 1.1, 1.2, 1.3 and 1.3.1 from target platforms

Due to a packaging error, M2E 1.1, 1.2, 1.3 and 1.3.1 included a copy
of jsr305.jar that was not approved for distribution. Affected m2e
versions were removed from download area according to a request from
Eclipse Legal team.

[1] http://wiki.eclipse.org/M2E_updatesite_and_gittags#m2e_releases
[2] https://dev.eclipse.org/ipzilla/show_bug.cgi?id=7302
Include SLF4J from Juno into Indigo TP

M2E's XML Editor requires SLF4J 1.6.2+ which is missing in Indigo:

    [ERROR] Cannot resolve project dependencies:
    [ERROR]   Software being installed: org.eclipse.m2e.feature.feature.group 1.4.0.20130601-0317
    [ERROR]   Missing requirement: org.eclipse.m2e.editor.xml 1.4.0.20130601-0317 requires 'bundle org.slf4j.api 1.6.2' but it could not be found
    [ERROR]   Cannot satisfy dependency: org.eclipse.m2e.feature.feature.group 1.4.0.20130601-0317 depends on: org.eclipse.m2e.editor.xml [1.4.0.20130601-0317]
Add waffle.io badge to README

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Merge pull request #164 from waffleio/patch-1

Add waffle.io badge to README
Merge pull request #165 from manandbytes/m2e-jsr305jar

Drop M2E 1.1, 1.2, 1.3 and 1.3.1 from target platforms