Add support for profile based aws authentication

[amalakar]

• Add support for aws profile based authentication
• Remove iml file from source control
• Update .gitignore file
• Bump aws sdk version to 1.11.118
• Move away from deprecated function new InstanceProfileCredentialsProvider() to InstanceProfileCredentialsProvider.getInstance().

I have verified that it works, was able to upload/download from s3.

[shenghuy]

+1

[VolodymyrOrlov]

+1