Update ruby snippets for Rails models and rspec

- attr snippet with menu for selecting: accessible, protected, etc...
  - validates snippet with key => value pairs
  - rspec loop and other shortcuts

ftplugin/ruby/ruby.xpt.vim

@@ -8,6 +8,18 @@ def `method^`
     `action^
 end
 
+XPT attr " attr_**
+XSET what=Choose(["accessible","protected","accessor","reader","writer"])
+XSET attr*|post=ExpandIfNotEmpty(', :', 'attr*')
+attr`_`what^ :`attr*^
+
+XPT validates " validates :attr ...
+validates :`attr^, `^
+
+XPT :presence synonym=:uniqueness|:acceptance|:confirmation|:numericallity " $_xSnipName => true
+XSET bool=true`^
+`:key({ 'val' : 'bool' }):^
+
 " eRuby attribute snippets
 
 XPT key hidden " $_xSnipName => val
@@ -34,20 +46,34 @@ XSET val={ `html^ }
 XPT :media alias=key
 XSET val='`screen^'
 
+XPT image_tag synonym=imt " image_tag...
+image_tag('`filename^'`, `opt?^)
+
 " RSpec snippets
 
-XPT loop " loop do .. end
-`loop^` `arg^ do
-    `cursor^
+XPT loop " $_xSnipName args? do .. end
+XSET content=Echo('')
+`$_xSnipName^` `args^ do
+`  `content^
 end
 
-XPT describe " describe .. do
-XSET name=describe
-`:loop({ 'loop' : 'name' }):^
+XPT describe synonym=it alias=loop
+XSET args="`^"
 
-XPT it " it .. do
-XSET name=it
-`:loop({ 'loop' : 'name' }):^
+XPT resp
+response.
 
 XPT :content " $_xSnipName => "val"
 `:key:^
+
+XPT shd abbr " should ...
+should `^
+
+XPT shn abbr " should_not ...
+should_not `^
+
+XPT shb abbr " should be_
+should be_
+
+XPT shnb abbr " should_not be_
+should_not be_