Pycaching

**Fixed:**
- messed up versioning in `setup.py`

**Added:**
- 151 (thanks to pkubiak for implementation and FriedrichFroebel for review)
- 152 (thanks to pkubiak for implementation and FriedrichFroebel for review)

**Fixed:**
- 150 (thanks to FriedrichFroebel)
- 149 (thanks to FriedrichFroebel)

**Fixed:**
- 146 (thanks to CachingFoX)
- 144 (thanks to CachingFoX)

**Added:**
- 128 (thanks to FriedrichFroebel)

**Fixed:**
- 138 (thanks to FriedrichFroebel)
- 140 (thanks to FriedrichFroebel)
- 141

**Fixed:**
- 131 (thanks to FriedrichFroebel)
- 132 (thanks to FriedrichFroebel)

**Removed:**
- 125 **Remove compatibility with Python 3.4**

**Added:**
- 126 (thanks to gcbor)
- 121 (thanks to Linzee)

**Fixed:**
- 124 (thanks to twlare)