Can't compile against 2.11

Hi,

It would be great to have this library cross-built for 2.10 and 2.11. I tried doing this myself, but am getting errors when I try to compile. I'm not sure of the best approach to fix.   

Here are the errors:


```
[error] /Users/jzulli/Code/datomisca/core/src/main/scala/datomisca/txFunctions.scala:26: in object AddTxFunction, multiple overloaded alternatives of method typed define default arguments.
[error] The members with defaults are defined in object AddTxFunction in package datomisca and trait AddTxFunctionGen in package datomisca and trait AddTxFunctionGen in package datomisca and trait AddTxFunctionGen in package datomisca and trait AddTxFunctionGen in package datomisca and trait AddTxFunctionGen in package datomisca and trait AddTxFunctionGen in package datomisca and trait AddTxFunctionGen in package datomisca and trait AddTxFunctionGen in package datomisca and trait AddTxFunctionGen in package datomisca and trait AddTxFunctionGen in package datomisca and trait AddTxFunctionGen in package datomisca and trait AddTxFunctionGen in package datomisca and trait AddTxFunctionGen in package datomisca and trait AddTxFunctionGen in package datomisca and trait AddTxFunctionGen in package datomisca and trait AddTxFunctionGen in package datomisca and trait AddTxFunctionGen in package datomisca and trait AddTxFunctionGen in package datomisca and trait AddTxFunctionGen in package datomisca and trait AddTxFunctionGen in package datomisca and trait AddTxFunctionGen in package datomisca.
[error] object AddTxFunction extends AddTxFunctionGen {
[error]        ^
[error] /Users/jzulli/Code/datomisca/core/target/scala-2.11/src_managed/main/datomisca/AddTxFunctionGen.scala:21: in trait AddTxFunctionGen, multiple overloaded alternatives of method typed define default arguments.
[error] private[datomisca] trait AddTxFunctionGen {
[error]                          ^
[warn] two warnings found
[error] two errors found
[error] (core/compile:compile) Compilation failed
```