Contract name collisions on truffle projects

[anxolin]

Issue

Error compiling a contract that depends on two different truffle projects, if these dependency projects have a contract with the same name.

Steps to Reproduce

Follow the steps in:
https://github.com/anxolin/truffle-dep-error

In the example I try to compile CoolApp contract that depends on DepA contract (in ./depA project), and DepB contract (in ./depB project).

DepA depends on a contract called Token, and DepB depends on a different contract called also Token.

Since truffles tries to output the files in truffle/contract folder, it fails to compile the second Token contract.

DeclarationError: Identifier already declared.

Expected Behavior

To be able to depend on different contracts with the same name.

Actual Results

DeclarationError: Identifier already declared.

Environment

N/A

[gnidan]

Closing this as duplicate of #1087