start working on FunctionIC gradient test (idaholab#3312)

test/tests/ics/function_ic/parsed_function.i

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+[Mesh]
+  type = GeneratedMesh
+  dim = 2
+  xmin = 0
+  xmax = 3.141
+  ymin = 3.141
+  ymax = 1
+  nx = 10
+  ny = 10
+[]
+
+[Variables]
+  [./u]
+    order = THIRD
+    family = HERMITE
+  [../]
+[]
+
+[Functions]
+  [./parsed_function]
+    type = ParsedGradFunction
+    value = 'sin(x)-cos(y/2)'
+  [../]
+  [./parsed_grad_function]
+    type =ParsedGradFunction
+    value = 'sin(x)-cos(y/2)'
+    grad_x = 'cos(x)'
+    grad_y = 'sin(y/2)/2'
+  [../]
+  [./parsed_zerograd_function]
+    type = ParsedGradFunction
+    value = 'sin(x)-cos(y/2)'
+    grad_x = '0'
+    grad_y = '0'
+  [../]
+[]
+
+[ICs]
+  [./u_ic]
+    type = FunctionIC
+    variable = 'u'
+    function = parsed_function
+  [../]
+[]
+
+[Kernels]
+  [./diff]
+    type = Diffusion
+    variable = u
+  [../]
+[]
+
+[Executioner]
+  type = Steady
+[]
+
+[Outputs]
+  output_initial = true
+  file_base = parsed
+  [./OverSampling]
+    type = Exodus
+    refinements = 3
+    oversample = true
+  [../]
+  [./console]
+    type = Console
+    perf_log = false
+  [../]
+[]

test/tests/ics/function_ic/tests

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+[Tests]
+  [./parsed_function]
+    type = 'Exodiff'
+    input = 'parsed_function.i'
+    exodiff = 'parsed_function.e'
+  [../]
+
+  [./spline_function]
+    type = 'Exodiff'
+    input = 'spline_function.i'
+    exodiff = 'spline_function.e'
+  [../]
+[]