memoised values in the input channels
don't serialise tags if for tagged elements if there is only one tag
using a weak hashmap to memoise wireformat metadata
use the same grouping instance if there is just one tag
added a variable in the MscrMapper to know if there are reduce tasks without using the configuration all the time
using the same tag value if there is only one tag
removed warnings in the build file
memoised the writable comparator
added a Files method
fixed the numbering of steps for a given Scoobi job
added some memory for the map reduce jobs on the cluster
updated the specs2 dependency
[#292] Added `repl:assembly` to build a fat jar for scoobi-repl.
[#292] Remove repl sub project and move script to main source tree.
[#292] Add `repl:dist` to build a tar ball containing the script and fat jar.
Use HADDOP_CONF_DIR if it is already set.
Remove original REPL launch script.

Has been replaced by src/main/bin/scoobi.
Handle symlinking of Scoobi REPL launch script.
setting the mode back to local if the cluster mode can't be initialised in the repl
added the target/scala-2.10/classes directory by default to the ScoobiApp classpath