fix $install_method to work properly

unfortunately, if one attempts to set the $install_method to an empty string,
puppet complains that you are interning an empty string. If you set it to undef,
then the parameterized default will get chosen.

To fix this, I replaced the $bundler::params::install_method default class
parameter value with 'rvm' (the value that $bundler::params::install_method
defaulted to) and then setup a test to determine if the $install_method was set
to undef, if so, then we set a second variable ($provider_method) to undef and
use that.

1 files changed, 2 insertions, 2 deletions

diff --git a/README.md b/README.md
index a792b86..f0b8c53 100644
--- a/README.md
+++ b/README.md
@@ -18,12 +18,12 @@ https://github.com/evanstachowiak/puppet-bundler bundler)
 
    By default this will install bundler with RVM, if you wish to use another
    method, you can pass any puppet package provider to the class as
-   'install_method', or just use '' if you wish the puppet parser to
+   'install_method', or just use undef if you wish the puppet parser to
    automatically chose the best method for your platform.
 
   Examples: class { 'bundler::install': install_method => 'fink' }; 
             class { 'bundler::install': install_method => 'gem' }; 
-            class { 'bundler::install': install_method => '' }
+            class { 'bundler::install': install_method => undef }
 
 3. Set whatever config variables are necessary: 
    bundler::config { 'linecache19':