fix terraform path on travis

.travis.yml

@@ -12,9 +12,8 @@ python:
 before_install: 'sudo apt-get install unzip'
 before_script:
   - 'wget https://releases.hashicorp.com/terraform/0.7.11/terraform_0.7.11_linux_amd64.zip'
-  - 'mkdir terraform'
-  - 'unzip terraform_0.7.11_linux_amd64.zip -d terraform'
-  - 'sudo ln -s $PWD/terraform/terraform /usr/local/terraform'
+  - 'unzip terraform_0.7.11_linux_amd64.zip'
+  - './terraform --version'
 
 install:
   - "pip install -r test/requirements.txt"

python_terraform/__init__.py

@@ -19,13 +19,15 @@ class Terraform:
                  state=None,
                  variables=None,
                  parallelism=None,
-                 var_file=None):
+                 var_file=None,
+                 terraform_bin_path=None):
         self.working_dir = working_dir
         self.state = state
         self.targets = [] if targets is None else targets
         self.variables = dict() if variables is None else variables
         self.parallelism = parallelism
-        self.terraform_bin_path = 'terraform'
+        self.terraform_bin_path = terraform_bin_path \
+            if terraform_bin_path else 'terraform'
         self.var_file = var_file
         self.input = False