Indent not working properly for Ruby files

[AbhishekSharma20]

Issue Type: Bug

for a Ruby file Indentation/collapse does'nt work properly as the end statements in comments are also considered.

eg:

class a
\#   def x
\#     ....
\#   end 
end

collapsing this will match first end(commented) with class tag.

VS Code version: Code 1.21.1 (79b44aa, 2018-03-14T14:46:47.128Z)
OS version: Windows_NT x64 10.0.15063

System Info

Item	Value
CPUs	AMD FX-9800P RADEON R7, 12 COMPUTE CORES 4C+8G (4 x 2695)
Memory (System)	7.47GB (3.16GB free)
Process Argv	C:\Program Files\Microsoft VS Code\Code.exe
Screen Reader	no
VM	0%

Extensions (5)

Extension	Author (truncated)	Version
solargraph	cas	0.13.0
sftp	lix	1.1.6
python	ms-	2018.2.1
Ruby	reb	0.17.0
autocomplete-english-word	wus	0.1.6

Reproduces without extensions

[dbaeumer]

@aeschli assigning to you because of folding.

[aeschli]

The current folding strategy is based purely on indentation.
In the near future, extensions can also provide syntax aware folding providers.
Duplicate of #3422