add endpoints-framework-all uberjar artifact

[tangiel]

• endpoints-framework-all now has all transitive dependencies included in its JAR, repackaged to avoid dependency conflicts
• endpoints-framework-guice no longer has endpoints-framework as a dependency, so that one can use the artifact with endpoints-framework or endpoints-framework-all.
• endpoints-framework-guice has a small Preconditions class now so that it doesn't have to depend on Guava, which it previously was transitively.
• POM URLs have been fixed to be the correct address.

[codecov-io]

Codecov Report

Merging #55 into master will decrease coverage by -0.05%. The diff coverage is 25%.

@@             Coverage Diff             @@
##             master     #55      +/-   ##
===========================================
- Coverage     79.74%   79.7%   -0.05%     
- Complexity     1617    1618       +1     
===========================================
  Files           153     154       +1     
  Lines          5427    5431       +4     
  Branches        698     698              
===========================================
+ Hits           4328    4329       +1     
- Misses          829     831       +2     
- Partials        270     271       +1

Impacted Files	Coverage Δ	Complexity Δ
...va/com/google/api/server/spi/guice/ServiceMap.java	73.68% <ø> (ø)	4 <ø> (ø)	:x:
...le/api/server/spi/guice/GuiceEndpointsServlet.java	0% <ø> (ø)	0 <ø> (ø)	:x:
...com/google/api/server/spi/guice/Preconditions.java	25% <25%> (ø)	1 <1> (?)

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