The r11 option was used to generate BEAM modules that could loaded both on both R11 and R12/R13 to facilitate testing that R11 and R13 nodes could communicate with each other. Since R14 is only required to be compatible with R12 and R13 nodes, the r11 option is no longer needed.
The .gitignore files ignores everything in the bootstrap/bin directory, includ checked-in *.boot and *.script files. That makes it impossible to check in updates to those files without using the -f (force option) with "git add". Fix this by adding a negated pattern for script and boot files.