Added a note that :jar true works for lein uberjar

Quick change to clarify the docs.
Merge pull request #169 from bitemyapp/patch-1

Added a note that :jar true works for lein uberjar
use :resource-paths for lein2 in subprojects
Passing subproject tests for lein2 using :resource-paths instead of :resources-path
Merge remote-tracking branch 'sgrove/lein2-subproject-fix' into 0.3.0
Start ripping out Lein 1 compat.  Issue #175.