support following filters:

  begin     Begin with the line that matches
  count     Count number of lines which match regexp
  exclude   Exclude lines that match
  include   Include lines that match
  section   Filter a section of output


ex, 

 ios.show_run :section=>'line'
 ios_show_run :include=>'address'
Version bump to 0.0.10
Cisco IOS default banner gets in the way of login.
$ irb -r expect4r --simple-prompt --noinspect
>> include Expect4r
=> Object
>> iost = Ios.new_telnet '192.168.131.11', 'lab', 'lab', 'secret_lab'
=> #<Expect4r::Ios:0x000000022ba190>
>> iost.login
=> #<Expect4r::Ios:0x000000022ba190>
>> iost.in?
=> exec
>> iost.logout
=> 
>> iost.login :no_enable=>true
=> #<Expect4r::Ios:0x000000022ba190>
>> iost.in?
=> user
>> iost.enable
=> [["term len 0\r\n", "R11#"], ["term width 0\r\n", "R11#"]]
>>
make interact sort of thread safe, changed termitate key to C-T.