Extending "AWS S3 Plugin" functionality.

[AliakseiTsiarnouski]

I would like to have a new steps, that will wait for newFile appearance with predefined path in S3 folders or time.

1 step for file finding:

• possibility to set time frame that predict when file appeared in the "expected folder" (ex. I upload a new file in 14:40 and expect that file should be in another folder in 14:40 or 41 min)
  when such file appearc -> file should be downloaded and filename saved as a variable/might be parsed by another steps.

2 step for file finding:

• it might be possible to set waitTime and do checks weather it already exists or not (ex. every 5 sec or not more than 60 times)
• would be great to have possibilities to concretize fileName or its part (ex. I wait for the file into the "internal folder"
  Amazon S3
  (full filename = OneBatch.xml)
  would be grate to set part(OneBatch) and find expected file
  and mix name parts for finding (ex. based on fileName above -> contains(HP) and contains (.xml) )