Indent if while for body when splits

[Janther]

while solving #138
I found that there's a mismatch between the AST for if (x) return true; and if (x) { return true; }.
Nonetheless, I found some benefits in the exercise of creating the feature so for the moment as a compromise, this PR indents the bodies of an IfStatement, ForStatement, and WhileStatement in case of them being too long.
I also added the case of forcing the indentation of a nested if.

// Before Prettier
if (a) if (b) return true; else return false; else if (c) break; else throw;

// After Prettier
if (a)
    if (b) return true;
    else return false;
else if (c) break;
else throw;

[codecov]

Codecov Report

Merging #159 into master will increase coverage by 0.05%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #159      +/-   ##
==========================================
+ Coverage    98.2%   98.26%   +0.05%     
==========================================
  Files          66       66              
  Lines         446      461      +15     
  Branches       56       60       +4     
==========================================
+ Hits          438      453      +15     
  Misses          8        8

Impacted Files	Coverage Δ
src/nodes/ForStatement.js	100% <100%> (ø)	⬆️
src/nodes/IfStatement.js	100% <100%> (ø)	⬆️
src/nodes/WhileStatement.js	100% <100%> (ø)	⬆️

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[mattiaerre]

apart for that small thing, this LGTM

[mattiaerre]

we shouldn't have these lines anymore

[Janther]

I was waiting for #157 to be merged. now I rebased to master.

[mattiaerre]

👍