[Task] bind task to another task

[siad007]

Related to #1241

[codecov]

Codecov Report

Merging #1259 into master will decrease coverage by 0.01%.
The diff coverage is 0%.

@@             Coverage Diff              @@
##             master    #1259      +/-   ##
============================================
- Coverage      50.3%   50.28%   -0.02%     
- Complexity     9515     9516       +1     
============================================
  Files           486      486              
  Lines         23321    23328       +7     
============================================
  Hits          11731    11731              
- Misses        11590    11597       +7

Impacted Files	Coverage Δ	Complexity Δ
classes/phing/Task.php	80% <0%> (-10.57%)	24 <1> (+1)

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