Remove last UnbalancedDataset references (#180)

Fix the directory in the CONTRIBUTING file and an example description.

Ref #127

Author: Linkid

CONTRIBUTING.md

@@ -18,7 +18,7 @@ GitHub:
 2. Clone this copy to your local disk:
 
         $ git clone [email protected]:YourLogin/imbalanced-learn.git
-        $ cd UnbalancedDataset
+        $ cd imblearn
 
 3. Create a branch to hold your changes:
 

examples/plot_unbalanced_dataset.ipynb

@@ -4,7 +4,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "# UnbalancedDataset\n",
+    "# imbalanced-learn\n",
     "\n",
     "### A python toolbox to tackle the problem of imbalanced dataset\n",
     "\n",
@@ -75,7 +75,7 @@
    "source": [
     "### Background\n",
     "\n",
-    "UnbalancedDataset is a python module offering a number of resampling techniques commonly used in datasets showing strong between-class imbalance.\n",
+    "imbalanced-learn is a python module offering a number of resampling techniques commonly used in datasets showing strong between-class imbalance.\n",
     "\n",
     "Most classification algorithms will only perform optimally when the number of samples of each class is roughly the same. Highly skewed datasets, where the minority heavily outnumbered by one or more classes, haven proven to be a challenge while at the same time becoming more and more common.\n",
     "\n",