Remove extra 'require' from checks

lib/brakeman/checks/check_escape_function.rb

 require 'brakeman/checks/base_check'
-require 'brakeman/processors/lib/find_call'
 
 #Check for versions with vulnerable html escape method
 #http://groups.google.com/group/rubyonrails-security/browse_thread/thread/56bffb5923ab1195

lib/brakeman/checks/check_execute.rb

 require 'brakeman/checks/base_check'
-require 'brakeman/processors/lib/find_call'
 
 #Checks for string interpolation and parameters in calls to
 #Kernel#system, Kernel#exec, Kernel#syscall, and inside backticks.

lib/brakeman/checks/check_filter_skipping.rb

 require 'brakeman/checks/base_check'
-require 'brakeman/processors/lib/find_call'
 
 #Check for filter skipping vulnerability
 #http://groups.google.com/group/rubyonrails-security/browse_thread/thread/3420ac71aed312d6

lib/brakeman/checks/check_mail_to.rb

 require 'brakeman/checks/base_check'
-require 'brakeman/processors/lib/find_call'
 
 #Check for cross site scripting vulnerability in mail_to :encode => :javascript
 #with certain versions of Rails (< 2.3.11 or < 3.0.4).

lib/brakeman/checks/check_nested_attributes.rb

 require 'brakeman/checks/base_check'
-require 'brakeman/processors/lib/find_call'
 
 #Check for vulnerability in nested attributes in Rails 2.3.9 and 3.0.0
 #http://groups.google.com/group/rubyonrails-security/browse_thread/thread/f9f913d328dafe0c

lib/brakeman/checks/check_quote_table_name.rb

 require 'brakeman/checks/base_check'
-require 'brakeman/processors/lib/find_call'
 
 #Check for uses of quote_table_name in Rails versions before 2.3.13 and 3.0.10
 #http://groups.google.com/group/rubyonrails-security/browse_thread/thread/6a1e473744bc389b

lib/brakeman/checks/check_redirect.rb

 require 'brakeman/checks/base_check'
-require 'brakeman/processors/lib/find_call'
 
 #Reports any calls to +redirect_to+ which include parameters in the arguments.
 #

lib/brakeman/checks/check_response_splitting.rb

 require 'brakeman/checks/base_check'
-require 'brakeman/processors/lib/find_call'
 
 #Warn about response splitting in Rails versions before 2.3.13
 #http://groups.google.com/group/rubyonrails-security/browse_thread/thread/6ffc93bde0298768

lib/brakeman/checks/check_sql.rb

 require 'brakeman/checks/base_check'
-require 'brakeman/processors/lib/find_call'
 
 #This check tests for find calls which do not use Rails' auto SQL escaping
 #

lib/brakeman/checks/check_strip_tags.rb

 require 'brakeman/checks/base_check'
-require 'brakeman/processors/lib/find_call'
 
 #Checks for uses of strip_tags in Rails versions before 2.3.13 and 3.0.10
 #http://groups.google.com/group/rubyonrails-security/browse_thread/thread/2b9130749b74ea12

lib/brakeman/checks/check_translate_bug.rb

 require 'brakeman/checks/base_check'
-require 'brakeman/processors/lib/find_call'
 
 #Check for vulnerability in translate() helper that allows cross-site scripting
 #http://groups.google.com/group/rubyonrails-security/browse_thread/thread/2b61d70fb73c7cc5