Redraw placeholder when recycling
Merge pull request #123 from alexchow/master

Redraw placeholder when recycling
Fixed StatFs bug occuring on some devices.

Fixes IllegalArgumentException occurring on some devices.

```java.lang.IllegalArgumentException
at android.os.StatFs.native_setup(Native Method)
at android.os.StatFs.(StatFs.java:32)
at com.squareup.picasso.Utils.int calculateDiskCacheSize(java.io.File)(Unknown Source)```
Fixed identation

Made two spaces instead of tabs
Made spaces before ```{``` and ```}```
Small fixes in identation

* Added spaces before size local variable
* Added space before catch
Merge pull request #124 from kkocel/patch-1

Fixed StatFs bug occurring on some devices.
Clean up.
Picasso 2.0
Code Review.
Merge pull request #126 from square/dimitris/dispatcher

Picasso 2.0
Part Deux
Hook up fetch() call, generify Request class.
Merge pull request #128 from square/dimitris/callback

Hook up fetch() call, generify Request class.
Make the imports sense
Merge pull request #129 from square/blom/make-clear

Make the imports sense
Fix tests.
Add @Config annotation to tests.
Let worker threads check cache instead of dispatcher.
Merge pull request #130 from square/dimitris/cache-hunter

Let worker threads check cache instead of dispatcher.
Changed WeakReference to RequestWeakReference to avoid a Class Cast Exception