Global binder is now the default parent when calling the binder
constructor. Call eith emptyenv() to duplicate previous behavior

Added the NAMESPACE file needed to make it a proper CRAN R package,
however I don't suppose I will support that. To package it as a CRAN
package one would still need to remove the top level closure.
Added combine option to collection injection, removed eager scope,
tweaked shim
Polish
Fixed multipackage shim
Added a quiet parameter to shim which defaults to true
Suppress loading message during shim, CRAN packaging
Merge pull request #18 from lev-kuznetsov/master

Global binder is now the default parent when calling the binder